assuming that you are saying 1/3/3 = 6/t,
then you could rewrite as:
1/3 *1/3 = 6/t
so you get:
1/9 = 6/t
then multiplying both sides by t you get:
t/9 = 6
then multiply both sides by 9 and you get:
t = 9*6 = 54
t = 54