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r in (-oo:+oo)
381.51 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
381.51-(3.14*(4/3)*r^3) = 0
381.51-4.18666667*r^3 = 0
-4.18666667*r^3 = -381.51 // : -4.18666667
r^3 = 91.12499993
r^3 = 91.12499993 // ^ 1/3
r = 91.12499993^(1/3)
r = 91.12499993^(1/3)
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