If the third proportional of and 4xy is 48, then the positive value of y is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 3.
Third proportional to 3x² and 4xy is 48
(4xy)² = 3x² × 48
→ 16x²y² = 144x²
→ 16y² = 144
→ y² = 9
→ y = 3