Proportions

Definition

Proportions are equations that state two ratios are equal. They are used to compare different quantities and solve problems involving relative sizes.

5 Must Know Facts For Your Next Test

1. A proportion can be written in the form a/b = c/d, where a, b, c, and d are numbers.
2. Cross-multiplication is a common method used to solve proportions.
3. Proportions can be used to predict unknown values when three of the four values in the ratio are known.
4. In statistics, proportions help compare data points within different datasets.
5. Visualizing proportions through graphs or charts can make complex data easier to understand.

Review Questions

• What is the proportion formula?
• How would you solve a proportion using cross-multiplication?
• Can you explain how proportions are used in visualizing data?

Related terms

Ratio: A comparison of two quantities by division.

Cross-multiplication: A method for solving equations involving fractions by multiplying across the equals sign diagonally.

Percentage: A way of expressing a number as a fraction of 100, often used to describe proportions.