Find The Missing Terms In Each Geometric Sequence _ ,4,12,36,_

Find the missing terms in each geometric sequence _ ,4,12,36,_

 

Answer:

_ ,4,12,36,_

Geometric Sequence

an=a1(r)ⁿ⁻¹

a1=?

r=12/4=3

an=36 (temporarily)

n=4 (where 36 is )

Find a1

an=a1(r)ⁿ⁻¹

36=a1(3)⁴⁻¹

36=a1(27)

Divide 27 both sides

a1=4/3

find a5

a5=(4/3)(3)⁵⁻¹

a5=(4/3)(3)⁴

a5=4/3(81)

a5=108

#JuneChallenge