Find the third proportional to Rs. 3, Rs. 12

Sum

Let x be the third proportional to Rs. 3 and Rs. 12
then Rs. 3 : Rs. 12 : : Rs. 12 : x
∴ x = `(12 xx 12)/(3)`
= 48
∴ Third proportional = Rs. 48.

shaalaa.com

Is there an error in this question or solution?

Chapter 6: Ratio and Proportion - Exercise 7.2

Chapter 6 Ratio and Proportion
Exercise 7.2 | Q 3.3

If y is the mean proportional between x and z, prove that: `(x^2 - y^2 + z^2)/(x^(-2) - y^(-2) + z^(-2)) = y^4`.

Find the third proportion to the following :

16x² and 24x

If three quantities are in continued proportion, show that the ratio of the first to the third is the duplicate ratio of the first to the second.

If x + 5 is the mean proportion between x + 2 and x + 9, find the value of x.

Write (T) for true and (F) for false in case of the following:

45 km : 60 km : : 12 h : 15 h

The sides of a triangle are in the ratio 1 : 3 : 5 and its perimeter is 90 cm. The length of its largest side is

If `a/c = c/d = e/f` prove that: `(a^3 + c^3)^2/(b^3 + d^3)^2 = e^6/f^6`

`square` : 24 : : 3 : 8

Write the mean and extreme terms in the following ratios and check whether they are in proportion.

400 gm is to 50 gm and 25 rupees is to 625 rupees

If 2x, 9 and 18 are in continued proportion, the value of x is ______.