how to find the four geometric means between 5 and 1215

Answer 1

sqroot(5*1215)=sqroot(6075)=77.9423

Answer 2

so you would have
5 m n o p 1215

that is..
a = 5 and t(6) = ar^5 = 1215
5r^5 = 1215
r^5 = 243
r = 3

so the 6 terms would be
5 15 45 135 405 1215