If two similar triangular prisms have volumes of 512 and 1331, find the scale factor

Let us say, the first triangle has a side "a",
and the second triangle, has a corresponding side
of "b",
so, the scale factor for the triangles is a to be or a:b
or a/b

now.... the relation of a/b to areas and volumes is  

now, taking a peek at your triangles
the volumes are 512 and 1331
so, the scale factor would be 

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