The volumes of spheres are proportional to R³. So their 'R's are proportional to ∛their volumes.
(729/ 27) = 27
∛27 = exactly 3 . No rounding required.
The ratio of the radii of the two spheres with volumes 729 in³ and 27 in³ is 3, as calculated by taking the cube root of the ratio of their volumes. No rounding is necessary because the result is already a whole number. Thus, the answer is 3.
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