The ring R/J of cosets of a fuzzy ideal J of a ring R is defined and shown to be isomorphic to a factor ring of R in a natural way. If f:R --> R' is an epimorphism of rings, a one-to-one order preserving correspondence is established between the fuzzy ideals of R' and those of R which are constant on the kernel of f. This generalizes the correspondence theorem of (non-fuzzy) ideals.