Find the fourth proportional to 4, 9 and 16.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 36.
Let the fourth proportional be x.
When the four numbers a, b, c and d are in proportion, then
ad = bc
According to the given question,
4 × x = 9 × 16
⇒ x = 36