Maharashtra BoardEnglish MediumSTD 7MathsRatio and Proportion2 Marks
Question
Find the third proportional to:
12 and 18
✓
Answer
Let x be the third proportional, then
$12 : 18 : : 18 : \text{x}$
$\Rightarrow12\times\text{x}=18\times18$
$\Rightarrow\text{x}=\frac{18\times18}{12}=\frac{3\times18}{2}=3\times9=27$
$\therefore$ Third proportional = 27
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