Find the fourth proportional to $3, 6$ and $4.5$ .

9

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7

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6

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10

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Solution

The correct option is A $9$
Let the fourth proportional to $3, 6$ and $4.5$ be $x$ .
$\Rightarrow 3 : 6 = 4.5 : x$
$\Rightarrow 3 \times x = 6 \times 4.5$
$\Rightarrow x = 9$

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