Solve proportions and simplify ratios. Leave one field empty to find the missing value.
Solving proportions: If A/B = C/D, then any missing value can be found by cross-multiplication.
A x D = B x C
For example, if 2:3 = X:9, then X = (2 x 9) / 3 = 6.
Simplifying ratios: Divide both numbers by their Greatest Common Divisor (GCD) to get the simplest form.
For example, 12:8 simplified = 3:2 (both divided by 4).