Definitions: Ratios, Proportions, and Rational Numbers

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Definitions related to ratios, proportions, and rational numbers.

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Ratio. The relationship between two numbers, represented as a quotient. The numbers in the ratio must have the same units of measurement or represent similar quantities.

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

Unit Rate. A rate expressed as a ratio with 1 in the denominator or sometimes as a decimal.

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

Rational Number. The ratio of two integers, a and b, where b is not equal to zero.

Irrational Number. A number that cannot be written as a rational number.

Irrational Number. A number that cannot be written as a rational number.