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# Proportions to Find Base b

## Cross - multiply to find a missing part of a proportion, base, b.

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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.
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## Proportions to Find Base b

Use the cross products of proportions to find base b in percent problems.
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## Precent Problems (Using Proportions & Equations)

Use the cross products of proportions to find base b in percent problems.
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