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Find the fourth proportional to 5, 9, 12, ….

Find the fourth proportional to 5, 9, 12, ….
[A]21.3
[B]21.6
[C]20.16
[D]20.06

21.6
Let the fourth proportional to 5, 9, 12 be x.
Then 5:9::12:x<=>5\times x=9\times 12
=>x=\frac{9\times 12}{5}=21.6
Hence the fourth proportional to 5, 9, 12 is 21.6

Originally written on June 3, 2016 and last modified on June 29, 2016.
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