Find the fourth proportional of s3, s2t, and st2.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. t3.
Let the given numbers a, b, c, and d be in the ratio.
So,
a : b : c : d
= a/b = c/d
Let's assume the fourth proportion of s3, s2t, and st2 is k.
⇒ s3 : s2t :: st2 : k
⇒ s3/s2t = st2/k
⇒ s/t = st2/k
⇒ k = t3