How to calculate a percentage

I am trying to calculate an estimated value for year 2008 knowing the 2014 & 2011 values.
If 2014 value is $800,000, 2011 value is $560,000 the the % increase is (800000-560000)/560000 = 43%.

How can I get an estimated value for 2008?

It's driving me nuts
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SimonConnect With a Mentor Commented:

I looked at it the other way round. The 2011 value is 70% of the 2014 value. 2008 is another 3 years back (an equal step) and if the rate of decrease is linear it would be 70% of 560,000, which is 392,000

Looking at it another way, 2014 value is 143% of 2011 value so to reverse that and go backwards use the inverse of 1.43, which is 0.7.
weephAuthor Commented:
Absolutely spot on thanks
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