  The problem of conformal transformation and conformal flatness of Finsler
spaces has been studied by so many researchers $\left[ 6,16,17,20,21\right] .$
Recently, Prasad et. al $\left[ 19\right] $ have studied three dimensional
conformally flat Landsberg and Berwald spaces and have given some important
results. The purpose of the present paper is to extend the idea of conformal
change to four dimensional Finsler spaces and find the suitable conditions
under which a four dimensional conformally flat Landsberg space becomes a
Berwald space.
