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Volume of a sphere = (4/3)πr³

Volume of a right circular cone = (1/3)πr²h

Volume of a cylinder = πr²h

Given, sphere, a cylinder and a cone have the same diameter. The height of the cylinder and also the cone are equal to the diameter of the sphere

Height of cone and cylinder = 2r

Ratio of their volumes = (4/3)πr³ : πr²h : (1/3)πr²h

⇒ Ratio of their volumes = 4r³ : 6r³ : 2r³ = 2 : 3 : 1