STEP-BY-STEP SOLVER

Ratio & Proportion Solver

Solve a proportion in the form a:b = c:x and see how cross multiplication isolates the missing value.

Enter the proportion

MISSING VALUE —

Step-by-step work

What is a proportion?

A proportion states that two ratios are equal. Writing ratios as fractions makes it easy to cross multiply and solve for a missing value.

Example: 3:4 = 12:x

Write 3/4 = 12/x. Cross multiply to get 3x = 48, then divide by 3. The missing value is 16.