Equivalent Ratio Calculator
The Equivalent Ratio Calculator finds the missing term in a proportion A:B = C:D. Enter three of the four values and it solves for the fourth, keeping the ratios equal.
Formula
A : B = C : D ⟹ D = (B × C) ÷ A
- Cross-multiplication keeps the two ratios equal.
- Enter A, B and C; the calculator solves for D.
2:3 = 8:D
Inputs
- A: 2
- B: 3
- C: 8
D = (3 × 8) ÷ 2 = 12, so 2:3 = 8:12.
Frequently asked questions
What is an equivalent ratio?
Two ratios are equivalent when they represent the same proportion, like 2:3 and 8:12.