Third proportional of a3 , 3a2 is…………….
a)9a
b)9a4
c)3a5
d)9a7
Solution: a3:3a2:: 3a2: y
y=9a
Fourth proportional of 5,8,15 is…………..
a) 120
b) 40
c)24
d)20
Fourth proportional
of 4x4,2x3,18x5 is……….
a)36x8
b)9x2
c)9x12
d)9x4
