📐 Math
Ratio Calculator
Simplify ratios to their lowest terms or solve proportions for missing values.
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Formula
A : B = C : DA, B- Known ratio pair
C, D- Proportional pair (one is unknown)
Example
Solving a Proportion
Find the missing value x in the ratio 3 : 5 = 12 : x.
- Set up the proportion as fractions: 3/5 = 12/x
- Cross-multiply: 3 × x = 5 × 12
- Simplify: 3x = 60
- Divide by 3: x = 20
- Result: x = 20
Frequently Asked Questions
A ratio is a relationship between two numbers indicating how many times the first number contains the second.
Divide both numbers in the ratio by their Greatest Common Divisor (GCD). For example, 20:30 simplifies to 2:3 because both are divisible by 10.
A proportion is an equation that says two ratios are equivalent, like 2:3 = 4:6.