Question
Find the third proportional to 5, 10
✓
Answer
Let $x$ be the third proportional to 5,10 , then $5: 10:: 10: x$
$
\begin{aligned}
& \therefore 5 \times x =10 \times 10 \\
& \Rightarrow x =\frac{10 \times 10}{5} \\
& =20 \\
& \therefore \text { Third proportional }=20 .
\end{aligned}
$
$
\begin{aligned}
& \therefore 5 \times x =10 \times 10 \\
& \Rightarrow x =\frac{10 \times 10}{5} \\
& =20 \\
& \therefore \text { Third proportional }=20 .
\end{aligned}
$
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