The similarity ratio is 1:4.
If the ratio of similarity is 310, then the ratio of their area is 96100.
Measure any two corresponding edges. The ratio of these edges is the similarity ratio.
2 to 5
Volumes are cubic measures so the similarity ratio is cuberoot(343)/cuberoot(1331) = 7/11
482/1282 = 241/641.
You call it similarity.
Reduce it if possible. Then set it equal to the similarity ratio of a-cubed over b-cubed, take the cubed route and theres your answer.