I need to find 2 values X1 and X2 which must respect next inequations and constrains:

Inequations:

1) (X1+X2)/360>=2.8E-03 or better >=3.0E-03 , ideal would be 3.2E-03 or 3.5E-03

2) 440*X1/(X1+X2)<350

3) 440*X2/(X1+X2)<200

4) 440*440*X1/[(X1+X2)*(X1+X2)]<1

5) 440*440*X2/[(X1+X2)*(X1+X2)]<0.6

Ideal would be to get at the 1) inequation the value >= as high as possible on the right side and at 4) and 5) inequations to get the values as low as possible at the right side as for example: at 4) instead of <1 to be <=0.6 and at 5) instead of <0.6 to be <=0.4.

Important to find the best matching values, no matter what method of calculations or approximation is used.

Any suggestions?

Sorry, not all of us use the terms "inequation" on a daily basis...

What is a "best matching value" (of either X1 or X2)?

Is that where the right side of the "inequations" are closest to the result of the corresponding left side without breaking the constraint imposed by the arithmetic comparison?

Do all "inequations" need to be "best matching", or a majority, or just one?