设圆柱的半径为r,高为h,则圆锥的半径为3r/2,高为h(1+2/3)=5h/3.
V圆柱：V圆锥
=πr^2h：(1/3)π(3r/2)^2(5h/3)
=1：(1/3)(9/4)(5/3)
=1：5/4
=4：5
答：圆柱与圆锥的体积比是4：5.