55 21 55
What is the pattern of 3/2, 5/3, 8/5, 13/8, 21/13, 34/21, 55/34, 89/55?
Looks like ratios of the Fibonacci sequence.
1+2 = 3
2+3 = 5
3+5 = 8
5+8 = 13
etc.
In general, if a/b and c/d are two consecutive terms, then the one after it is (a+c)/(b+d).
By the way, this sequence converges to the Golden Ratio, (1+sqrt(5))/2
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