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# Ratios & Proportions

### Vocabulary for Ratios and Proportional Relationships Unit Grade 7

TermDefinition
direct variation A relationship between two quantities such that one quantity changes at a constant rate with the other quantity.
rate A ratio that compares two quantities with different units; it shows how fast or slow something is changing.
scale model A proportional three-dimensional representation of an object.
proportion An equation that states that two ratios are equal.
unit rate A rate that shows the constant rate of change in the units of the numerator for every one unit of the denominator.
scale A ratio that compares the measurements of a drawing or model with the actual measurements of the object.
variable A letter or symbol used to represent an unknown quantity.
cross products A strategy that can be used to solve proportions for an unknown and to determine proportionality.
scale drawing A proportional two-dimensional representation of an object.
origin The graphs of proportional relationships is a straight line that passes through this point, (0, 0).
constant of proportionality The unit rate or slope of a proportional relationship is also called this.
Created by: EYLERD110