Solution: let the side length of the cube be xcm；; According to the meaning of the question, there are

x？ =64;

The volume of the cone = 1/3×x? ×3. 14×x

? = 1/3×3. 14×x？ ................... (.instead of x? =64)

? = 1/3×3. 14×64

≈66.99cm？