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Module 4 Vocabulary Constant – a value that does not change Constant of proportionality – a constant ratio of two variables related to proportionality Conversion factor – a number used to change one set of units to another, by multiplying or dividing Ratio – a comparison of two quantities by division Equivalent ratios – ratios that name the same comparison Percent – a ratio comparing a number to 100 Rate – a ratio that compares two quantities measured in different units Unit rate – a rate in which the second quantity in the comparison is one unit Rate of change – a rate that describes how one quantity changes in relation to another quantity Proportion – statement that two rates or ratios are equivalent Proportional relationship – a relationship between two quantities in which the ratio of one quantity to the other quantity is constant Complex fraction – a fraction that contains one or more fractions in the numerator, the denominator, or both Constant a value that does not change Constant of proportionality a constant ratio of two variables related to proportionality Conversion factor a number used to change one set of units to another, by multiplying or dividing Ratio a comparison of two quantities by division Equivalent ratios ratios that name the same comparison Percent a ratio comparing a number to 100 Rate a ratio that compares two quantities measured in different units Unit rate a rate in which the second quantity in the comparison is one unit Rate of change a rate that describes how one quantity changes in relation to another quantity Proportion statement that two rates or ratios are equivalent Proportional relationship a relationship between two quantities in which the ratio of one quantity to the other quantity is constant Complex fraction a fraction that contains one or more fractions in the numerator, the denominator, or both