Question : The fourth proportional to 6, 8, and 12 is:
Option 1: 15
Option 2: 12
Option 3: 18
Option 4: 16
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Correct Answer: 16
Solution :
Let the fourth proportion to the three numbers 6, 8, and 12 be $x$.
So, 6 : 8 :: 12 : $x$
$⇒\frac{6}{8}=\frac{12}{x}$
$⇒x = \frac{12\times 8}{6}$
$\therefore x=16$
Hence, the correct answer is 16.
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