Algebra-1

Question Analysis
This question assesses the student's understanding of solving proportions where the unknown is in the denominator. The given proportion is .

Key Concept Explanation
Cross-multiplication is a method to solve proportions by multiplying the numerator of one fraction by the denominator of the other, setting the products equal: , so .

Step-by-step Solution
1. Set up the proportion:
2. Cross-multiply:

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