How does the pressure vary?

Question

The pressure P exerted by a liquid on an object varies directly with the depth d of the object. If an object at depth 3m undergoes a pressure of 485 Kg/m2, find the pressure on an object at 7m.

Answer 1

3/485  = 7/ x

then 3x  = 7*485  = 3395

then x  =  1131.67 kg/m²