Question

What should be subtracted from 12 ,19,36, and 64 , so that they are in proportion?

Answer 1

Let x will be subtracted from 12, 19, 36 & 64

Therefore the numbers will be 12-x, 19-x, 37-x & 64-x

By the problem,

$\frac{12 - x}{19 - x} = \frac{36 - x}{64 - x}$
Just solve this equation...( The value of x will be 4)