Main idea: Ratios, rates, and unit rates 1. Fill in the blanks to define the terms. A ratio _______________ two quantities. A proportion is an equation stating that two _______________ are equal. A rate compares two quantities that have different _______________. 2. Complete the statement to describe unit rates. Then identify whether each ratio is a unit rate by placing an X in the appropriate column. A unit rate is a ratio that compares an amount of one quantity to _______________ unit of another quantity.