# Proportions

## Multiplication to solve for an unknown given two equal ratios.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Proportions

Write and solve proportions.
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## Proportions

Learn to recognize proportions as a statement of equivalent ratios
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## Write and Solve Proportions by Using Equivalent Rates

Learn to write and solve proportions by using equivalent rates.
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## Proportions : A Sample Application

This video demonstrates a sample use of proportions.
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