A football, meant to be thrown at 100 km/h in sea level air (ρ=1.22 kg/m³, μ=1.78×10^-5N-s/m²). is to be tested using a one-quarter scale model in a water tunnel (ρ=1000 kg/m³, μ=10^-3N-s/m²). For dynamic similarity, the ratio of the model force to the prototype force is _______ (round to nearest integer).