Question
Find the fourth proportional to 1.5, 2.5, 4.5
✓
Answer
Let fourth proportional to $1.5,2.5,4.5$ be $x$ then $1.5: 2.5:: 4.5: x$
$
\begin{aligned}
& \therefore 1.5 \times x=2.5 \times 4.5 \\
& x=\frac{2.5 \times 4.5}{1.5} \\
& =7.5
\end{aligned}
$
$
\begin{aligned}
& \therefore 1.5 \times x=2.5 \times 4.5 \\
& x=\frac{2.5 \times 4.5}{1.5} \\
& =7.5
\end{aligned}
$
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