Question : What is the fourth proportional to 7, 15, and 21?
Option 1: 29
Option 2: 30
Option 3: 48
Option 4: 45
Answer (1)
2nd Jan, 2024
Correct Answer: 45
Solution :
The fourth of proportional of $a,b$ and $c=\frac{b×c}{a}$
So, the fourth proportional of 7, 15, and 21 = $\frac{15×21}{7}$ = 45
Hence, the correct answer is 45.
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