Ratio and Proportion — Mathematics STD 10 — Question
ICSE BoardEnglish MediumSTD 10MathematicsRatio and Proportion1 Mark
MCQ
The third proportional to $\frac{36}{15}$ and 3 is :
A
15
B
4
✓
$15 / 4$
D
$4/15$
✓
Answer
Correct option: C.
$15 / 4$
(c) $15 / 4$ Explanation: The third proportional to $\frac{36}{15}$ and 3 is given by $\begin{array}{l}\frac{36}{15}: 3:: 3: x \\ \Rightarrow \frac{36}{15}+3=3 \div x \\ \Rightarrow \frac{36}{15 \times 3}-\frac{3}{x} \\ \Rightarrow x=\frac{3 \times 15 \times 3}{36} \\ \Rightarrow x=\frac{15}{4}\end{array}$
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