Question

If \(9 : 15 : : 45 : x\), then the value of \(x\) is

• A. 75
• B. 3
• C. 27
• D. 9

Hint:

Use the cross-multiplication method to solve problems involving proportions.

Answer 1

The Correct Option is C

Proportionality yields: \[\n\frac{9}{15} = \frac{45}{x}\n\] Cross-multiplication gives: \[\n9x = 15 \times 45 \quad \Rightarrow \quad x = \frac{15 \times 45}{9} = 75\n\] Therefore, the answer is 75.