Question

Find the fourth fourth proportional of 30, 32,42

Answer 1

Answer:

30:32=42:x

30/32=42/x

Answer 2

The fourth proportional to 30, 32,42 is 44.8.

To find :-

The fourth proportional to 30, 32,42.

Solution :-

Let the fourth proportional to 30, 32,42 be x.

Then, 30, 32,42 and x are in proportion.

i.e.

$\frac{30}{32} =\frac{42}{x}$

Now, solving it

$\frac{30}{32} =\frac{42}{x} \\ \\=> 30 \times x = 42 \times 32 \\ \\(By\:\: cross \:\:multiplication) \\ \\=>x=\frac{42 \times 32}{30} \\ \\=>x =\frac{1344}{30} \\ \\=>x= 44.8$

Answer :-

The fourth proportional to 30, 32,42 is 44.8.