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Published byAmos Harris Modified over 8 years ago

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2.5 Solving Proportions Write and use ratios, rates, and unit rates. Write and solve proportions.

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A ratio is a comparison of two quantities. A ratio can be written as

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Example: Reduce Ratios

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Practice

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A rate is a ratio of two quantities with different units. A unit rate is a rate with a second quantity of 1 unit. You can convert any rate into a unit rate.

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Example: Divide Rates

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Practice

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A statement that two ratios are equal is called a proportion. You can solve a proportion by using the cross products property, then an inverse operation.

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Example: Cross Multiply, Divide

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Practice

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A percent is a ratio that compares a number to 100. You can use the following proportion to find unknown values.

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Examples

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Practice

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Proportions are used to create scale drawings and scale models. A scale is a ratio between two sets of measurements. A scale drawing or scale model uses a scale to represent an object as smaller or larger than the actual object.

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Example

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REVIEW 1)What is a ratio? 2)What is a rate? 3)What is a proportion? 4)What is a scale drawing?

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