The 29-year-old athlete won the singles race.
Prakaten showed the result of 7 minutes 47.458 seconds.
The silver medal was won by Kira Yuvchenko, the bronze medal was won by Maria Botalova.
Vice-champion of the Tokyo Olympics Elena Oryabinskaya showed the best time of 7 minutes 40.551 seconds in the race of twos paired with Ekaterina Sevostyanova.
Ekaterina Glazkova and Marina Rubtsova took second place, Ksenia Yakimtsova and Tatyana Varshavskaya took third place.
Earlier it was reported that the Russians for the first time took the bronze of the European Championship in sailing in team races in the Optimist class.