Understanding Proportions

Proportions express the equality between two ratios, crucial in scaling recipes, resizing images, and solving many mathematical problems. They maintain relationships between quantities when scaling up or down.

Step-by-Step Guide

Enter three known values (A, B, and C) in the proportion A/B = C/D
Leave the unknown value (D) empty
Click Calculate to solve for D using cross-multiplication: D = (B × C) / A

Examples

Scaling: A recipe requires 2 eggs for 4 people. For 10 people: 2/4 = C/10 → C = 5 eggs
Maps: 1cm represents 5km. How many km is 4cm? 1/5 = 4/D → D = 20km

Common Ratios Reference

Scenario	Typical Ratio
Map Scale	1:24,000
Screen Resolution	16:9
Baking (Flour:Sugar)	3:1

Tips & Warnings

Ensure consistent units across all values
Verify that A is not zero to avoid division errors
Round results appropriately for your use case

Proportion Calculator

Understanding Proportions

Step-by-Step Guide

Examples

Common Ratios Reference

Tips & Warnings

Unit Converter

Frequently Asked Questions

What is a proportion?

Can I use fractions instead of decimals?

What if I get an error?

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Proportion Calculator - Solve Proportions Step by Step

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