Definitions: Proportions and Proportional Relationships

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Definitions related to proportions.

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Proportion. When two ratios are equal, they form a proportion.

Proportional. The relationship between two quantities or variables, such that a change in one results in a direct change in the other.

Constant of Proportionality. When two quantities or variables are proportional, the constant term that scales one variable to the other.

Equivalent Ratios. Two ratios that are numerically equal to each other.

Direct Variation. A linear function of the form y = kx, for some constant k, called the constant of variation.