The volume of soccer ball is

\(V_{(soccer)}=4/3\pi r^3\)

diameter of ball s 1.1 times therefore the volume of the basketball is

\(V_{(basketball)}=4/3*\pi*(1.1r)^3\)

\(V_{(basketball)}=4/3*\pi*1.331*r^3\)

\(V_{(basketball)}=1.331V_{(soccer)}\)

since the diameter of tennis ball is about 0.3 times that of a scoccer ball it's radius is also 0.3 times

\(V_{(tennis)}=4/3*\pi*(0.3r)^3\)

\(V_{(tennis)}=4/3*\pi*0.027*r^3\)

\(V_{(tennis)}=0.027_{(soccer)}\)