Algebra-1

Question Analysis
This question tests the student's understanding of the definition and application of proportions. The problem involves a simple proportion where the student must use the cross-multiplication rule to solve for the unknown variable.

Key Concept Explanation
A proportion is an equation stating that two ratios are equal. The cross-multiplication rule allows us to solve for an unknown variable by multiplying the numerator of one fraction by the denominator of the other and setting the products equal.

Step-by-step Solution
1. Start with the given proportion:
2. Apply the cross-multiplication rule:
3. Simplify the equation:

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