Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
fifth [fɪfθ] adj пя́тый
n (fraction) пя́тая f adj (AUT) (also: fifth gear) пя́тая ско́рость f
he came fifth in the competition он за́нял пя́тое ме́сто в соревнова́нии
fifth form (BRIT) (SCOL) пя́тый класс
I was (the) fifth to arrive я пришёл пя́тым
Henry the Fifth Ге́нрих Пя́тый
the fifth of July, July the fifth пя́тое ию́ля
I wrote to him on the fifth я написа́л ему́ пя́того (числа́)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: