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The K-MM radiative-Auger transition probabilities for Ca, Ti and Cr were calculated using time-dependent perturbation theory. The atom plus the free radiation field are considered as being one system and the transition of one state of the atom to another results from the interaction between components of this system. The perturbing Hamiltonian is taken as the sum of the interaction between the electrons participating directly in the process and their interaction with the radiation field. Under this approach, the radiative-Auger process is described considering second-order terms in time-dependent perturbation theory series. The calculations were performed using screened hydrogenic wavefunctions to describe the state of the atom. The results obtained are compared with recent experimental data and other theoretical calculations.