Find the fourth proportional to 7x - 1, 9x + 5 and 8x + 1, if x = 3.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 40.
Calculations:
Let the fourth proportional be y.
After putting the value of x = 3, we get
⇒ 7(3) - 1, 9(3) + 5, 8(3) + 1, y
⇒ 20, 32, 25, y
According to the question;
⇒ 20/32 = 25/y
⇒ y = 40