Determine the fourth proportional to 9 .6 m 7 .2 m 28.8

Let the fourth proportional be x.
∴ 9.6 kg : 7.2 kg . : : 28.8 m : xm
o r, 9.6 : 7.2 : : 28.8 : x

Then ,	9.6	=	28.8
	7.2		x

⇒ 9.6 × x = 7.2 × 28.8

⇒ x =	7.2 × 28.8	= 21.6 m
	9.6