Geometric Sequence

Jul 2015
564
14
United States
2nd term=3
4th term=1/3
6th term= unknown, find.

3=ar
1/3=ar^3

Then that equals 9=r^2

r=3

6th term= ar^n-1
6th term=a(3)^5
6th term=a243

Where did I mess up at ?