The fourth proportional to 5, 8, 15 is [Canara Bank (PO) 2011] |
A) 18
B) 24
C) 19
D) 20
E) 21
Correct Answer: B
Solution :
Let the fourth proportional be x. |
Then, \[5:8::15:x\] |
\[\Rightarrow \] \[5\times x=15\times 8\] |
\[\because \]Product of extremes = Product of means |
\[\Rightarrow \] \[x=\frac{120}{5}\]\[\Rightarrow \]\[x=24\] |
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