3:7; you just divide each number by 7.
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They are: 3 and 7
If the ratio of side lengths is 49 (that is 49 to 1) then the ratio of their volumes is 493 to 1, which is 117,649 to 1.
49 to 100
69
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.