Proportions Calculator

Proportions Calculator

# Proportions

CALCULATOR

## Proportions Calculator We have some questions for you! Help us out through this
INTRO

A ratio is a comparison of two quantities, and a proportion is an equation that lets us know two ratios are equal to each other.

So when we solve a proportion, we’re really just solving an equation, and we find that it’s easiest to do this when the ratios are written as fractions.

The top and bottom of each side of the equation form the 4 corners of an x, which means we can cross-multiply to solve for the unknown.

Remember, we can only cross-multiply when we have two ratios or fractions that are equal to each other - x marks the spot! We can also use cross-multiplication to double check that two ratios are equivalent and form a proportion:

 Cross-Multiply Result ✅ Equal / Proportion Not equal / Not a proportion
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KEY STEPS

## How to Solve a Proportion

### Step 1. Write the ratios as fractions.

If the ratios are already in fraction format, continue to Step 2.

### Step 2. Cross-multiply if x marks the spot.

The top and bottom of each side of the equation form the 4 corners of an x.
This means we can multiply across the diagonals, and the products are equal.

### Step 3. Divide.

If solving for an unknown, divide both sides of the equation by the number it’s being multiplied by.
LESSON
Solving Proportions
PRACTICE
Solving Proportions
CONCLUSION
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