Proportion Calculator
Solve a / b = c / x → x = (b × c) / a
FIRST RATIO
SECOND RATIO
Proportion Calculator – Solve a/b = c/x Easily
The Proportion Calculator helps you quickly solve ratios and find the missing value in a proportional equation. In mathematics, a proportion means two ratios are equal. By using the method of cross multiplication, you can easily calculate the unknown value in the equation.
For example, if you know three numbers in a proportion like a / b = c / x, the calculator can instantly determine the missing value x.
What Is a Proportion?
A proportion is a mathematical relationship that shows two ratios are equal. It is commonly written in the form a / b = c / d, where both fractions represent the same value.
In simple terms, a proportion compares two ratios to show that they have the same relationship. Proportions are widely used in mathematics, finance, cooking recipes, engineering measurements, and many everyday calculations where values need to stay in the same ratio.
Proportion Formula
Cross multiply:
Step-by-Step Solution
Step 1: 3 × x = 4 × 6
Step 2: 3x = 24
Step 3: x = 24 / 3
Examples of Proportion Calculations
Example 1
2 / 5 = 10 / x
2x = 50
x = 25
Example 2
4 / 7 = 12 / x
4x = 84
x = 21
Example 3
5 notebooks cost $10
12 notebooks cost = ?
x = 24
Real-Life Uses of Proportions
Cooking
Adjust ingredient quantities when changing recipe servings.
Finance
Calculate proportional salary and profit.
Engineering
Scale drawings and measurements.
Education
Solve algebra and ratio problems.
FAQ on Proportion Calculator
A proportion is an equation showing that two ratios are equal.
Solve proportions using cross multiplication.
Cross multiplication means multiplying diagonally in a proportion equation.