8
The first four terms of a geometric sequence are 108,36,12,4... the common ratio is 1/3.
common ratio = 4/12 = 12/36 = 36/108 = 1/3
Added 6/29/2016 4:25:18 PM
This answer has been confirmed as correct and helpful.
Confirmed by
vchutkan [6/29/2016 5:07:56 PM]