What force magnitude on the small piston will balance a 39.6 kN force on the large piston?

A piston of the cross-sectional area is used in a hydraulic press to exert a small force of magnitude f on the enclosed liquid. A connecting pipe leads to a larger piston of cross-sectional area A (Fig. 14-36). If the piston diameters are 2.94 cm and 51.7 cm, what force magnitude on the small piston will balance a 39.6 kN force on the large piston?