QPR levelled after a neat one-touch passing move as Isaac Hayden drove into the penalty area and found Saito, who turned his marker and drilled a thunderous finish into the roof of the net.
However, Rovers regained their advantage just minutes later after Saito was caught in possession by Sondre Tronstad, who swiftly played in Jorgensen to fire his second beyond Hoops goalkeeper Joe Walsh.
Tronstad was also the architect of Blackburn’s third shortly after the break, dropping a cross from the right straight onto the head of the unmarked Morishita, who nodded home from close range.
The R’s, who are four points outside the play-off spots in 13th, rarely looked like retrieving that deficit and, although Kone had an attempt deflected wide, it took them until stoppage time to seriously threaten Toth’s goal again.
The Blackburn keeper clawed away Ronnie Edwards’ glancing header from a free-kick, with the follow-up hacked off the line and, despite having to survive 11 minutes of added time, the visitors saw out the game.
The only downside for Rovers, who climb three places to 19th in the table, was the loss of half-time substitute Lewis Miller, stretchered off just minutes after his arrival on the pitch.
