Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
gratify [ˈgrætɪfaɪ] vt (person) ра́довать (пора́довать perf) (whim, desire) удовлетворя́ть (удовлетвори́ть perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.