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See sheet column Q.<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/03_w13/1447844/900W-CFM56-7B26-v3.xlsx" target="_blank" class="file-inline" title="x and y calculation (17 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>900W-CFM56-7B26-v3.xlsx</a>
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900W-CFM56-7B26-v3.xlsx

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Thanks again for you help.<br />
<br />
I will look into your suggestion.<br />
<br />
In the meantime I figured an inverse would be easier with the help of a module.<br />
With the help of internet I came up with the solution in cell P8 in the attached file.<br />
<br />
Would it be also be possible to inverse the module?<br />
<a href="https://filedb.experts-exchange.com/incoming/2020/03_w13/1447915/900W-CFM56-7B26-v2.xlsm" target="_blank" class="file-inline" title="version 2 adjusted to the use of a mudule (32 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>900W-CFM56-7B26-v2.xlsm</a>
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version 2 adjusted to the use of a mudule

900W-CFM56-7B26-v2.xlsm

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As you see in the file it can be calculated, so a VBA function would be able to do the same.
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At a second glance of my question I missed out a detail.<br />
<br />
My goal is to input the zvalue and xvalue, and return the &nbsp;yvalue.<br />
<br />
This is because the previous table is the first of three consecutive &nbsp;tables that are all related to each other. The output of the first is the input for the second and so on.<br />
<br />
Now I want to subtract the outcome of the third from the first and do the inverse interpolation on the second table to finf the yvalue.<br />
<br />
Would it be possible to adjust your suggestion to the input of the zvalue and xvalue to return the y value?<br />
<br />
Regards
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900W-CFM56-7B26-v3.xlsm

faraoosiris

<div>
Thank you again for going the extra mile and to adjust and create the VBA function.<br />
<br />
I 'am no going to try to put all the tables together and make it work the way I envision.
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<div class="content wysiwyg-content">
With the help of you experts I solved my last question 29175699 on <a href="https://www.experts-exchange.com/questions/29175699/Bilinear-interpolation-on-missing-z-values-Excel.html" rel="ugc">Bilinear interpolation on missing zvalues excel</a>.<br />
<br />
Pure reasoning makes me think it would be possible to take an other element out of the equation.<br />
Would it be possible to get the y value through the input of a z value and x value.<br />
<br />
My mathematical skills are near to none. How to go about to make this work. Any suggestion to get me started are welcome.
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</div>


With the help of you experts I solved my last question 29175699 on Bilinear interpolation on missing zvalues excel (https://www.experts-exchange.com/questions/29175699/Bilinear-interpolation-on-missing-z-values-Excel.html).

Pure reasoning makes me think it would be possible to take an other element out of the equation.
Would it be possible to get the y value through the input of a z value and x value.

My mathematical skills are near to none. How to go about to make this work. Any suggestion to get me started are welcome.

Inverse bilinear interpolation Excel

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