Algebra-1

Question Analysis
This question tests the student's ability to solve a proportion for an unknown variable when one of the variables is given. The given proportion is with .

Key Concept Explanation
Cross-multiplication is used to solve for the unknown variable in a proportion. The method involves multiplying the numerator of one fraction by the denominator of the other and setting the products equal.

Step-by-step Solution
1. Substitute into the proportion:
2. Cross-multiply:

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