Ratio and Proportion

What is Ratio and Proportion?

A ratio compares two or more quantities of the same kind measured in the same unit, written with colons and simplified by dividing every part by a common factor. Proportion is the relationship between those quantities when one changes: in direct proportion their quotient stays constant, and in inverse proportion their product stays constant.

This definition is part of the Number chapter in Cambridge O Level Mathematics (Syllabus D).

Concepts related to Ratio and Proportion

• unitary method
• scale factor
• direct proportion
• inverse proportion