Question

a photograph negative measures 1 7/8 inches by 2 1/2 inches. the printed pictures is to have its longer dimension be 4 inches. how long should the shorter dimension be?

Answer 1

Ooo neat problem :)
So this is really important with pictures.
We don't want the image to come out all skewed and weird looking.

So we need to preserve the proportions.

Answer 2

Here is a diagram that illustrates the situation we have.