Explanation:
so, 36 : 54
36×1/2 = 18
so, 18 : 27
36×1/3 = 12
so, 12 : 18
36×2/3 = 24
so, 24 : 36
36×1/4 = 9, but 54 can't be divided by 4.
36×1/5 no
36×1/6 = 6
so, 6 : 9
36×2/6 = 36×1/3 done
36×3/6 = 36×1/2 done
36×4/6 = 36×2/3 done
36×5/6 = 30
so, 30 : 45
36×1/7 or 1/8 no
36×1/9 = 4
so, 4 : 6
36×2/9 = 8
so, 8 : 12
36×3/9 = 36×1/3 done
36×4/9 = 16
so, 16 : 24
36×5/9 = 20
so, 20 : 30
36×6/9 = 36×2/3 done
36×7/9 = 28
so, 28 : 42
36×8/9 = 32
so, 32 : 48
36×1/10, ×1/11 no
36×1/12 = 3, but 54 can't be divided by 12.
36×1/13, ×1/14, ×1/15, ×1/16, ×1/17 no
36×1/18 = 2
so, 2 : 3
36×2/18, ×3/18, ×4/18 done
36×5/18 = 10
so, 10 : 15
36×6/18 done
36×7/18 = 14
so, 14 : 21
36×8/18, ×9/18, ×10/18 done
36×11/18 = 22
so, 22 : 33
36×12/18 done
36×13/18 = 26
so, 26 : 39
36×14/18, ×15/18, ×16/18 done
36×17/18 = 34
so, 34 : 51