For real gases, how does a change in pressure affect the ratio of pv to nrt?

At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of the gas. PV = n RT, where R is the universal gas constant. A change in pressure depends with the number of moles of the gas, such that if the number of moles increases then there are many vibrations and collision of the gas molecules with the walls of a container thus increasing the pressure and vice versa.