Proportions Solver
Leave one box blank for the missing value (x), and I will solve it step-by-step using cross-multiplication!
Cross-Multiplication Steps
Working Steps
Missing Value Result
Learning All About Proportions
What is a Proportion?
A proportion is a math statement showing that two fractions or ratios are completely equal to each other. Think of it like cooking a recipe or sizing up a picture: if you double the height, you must also double the width to keep it looking perfect!
The Magic Secret: Cross-Multiplication
When two ratios form an exact proportion, multiplying diagonally across the equals sign will always yield the exact same answer. This rule is called the Product of Extremes equals Product of Means:
How to Find a Missing Value in 3 Steps
1 Cross Multiply
Multiply the two complete opposite numbers forming a full diagonal line across the equals sign.
2 Divide
Divide that total product by the third remaining number that sits opposite your missing variable x.
3 Balanced!
That final quotient unlocks your missing value, restoring perfect mathematical equality to the balance.