Algebra-1

Question Analysis
This question tests the student's ability to solve for an unknown variable in a proportion related to similar triangles. The problem requires the student to use cross-multiplication and basic algebra to find the value of .

Key Concept Explanation
Cross-multiplication is a method used to solve proportions by multiplying the numerator of one fraction by the denominator of the other, setting the products equal. This transforms the proportion into a simple equation.

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

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