You divide the first something by the second something. You can, if you like, simplify the resulting fraction.
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The answer depends on the ratio of the shape to what!
The ratio of two numbers is simply the smallest way of expressing them eg. 1000 to 2000 is 1 to 2. If you divide the bigger number by the smaller number you would get a ratio of 1 to something.
The answer depends on what ratio of the triangle you are interested in.
multiply by 2
If the ratio of the radii is 1:3 then the ratio of volumes is 1:27.