Adding power attic ventilation with Cobra vent?

I have an attic space with a bonus room. The room sits under a high-pitched roof and there's a large triangular space above it which ends with an exterior wall. There is a Cobra ridge vent above the room. During the summer, the attic space gets very hot and it's hard to keep the room cool. I'm wondering if it would be a good idea to install a gable vent with a thermostatic fan to draw cool air into the space above the room, or would this interfere with the Cobra vent?