Forte was 12 of 15 from the floor and the Vikings (7-10, 3-3 Big Sky) made 64.2 percent (34 of 53). Zach Gengler and Calaen Robinson each had 13 points with three 3-pointers and Isaiah Pineiro scored 10.
Sacramento State (8-9, 1-5) closed within eight on Jiday Ugbaja's layup with 8:03 to go. Portland State pulled away with an 11-2 run to lead 69-52 with 3:40 left.
Portland State, which led the entire way, made nine straight field-goal attempts late in the first half to build a 44-27 lead at the break.