Steps of construction
(1).Draw any ray PX making an acute angle with PQ on the side opposite to the verterx Q.
(2).Mark four points on PX P1,P2,P3 and P4 on PX so that PP1=P1P2=P2P3=P3P4
(3).Join P4Q and draw a line through P3 parallel to P4Q, to intersects PQ at Q′.
(4).Draw a line through Q′ parallel to the line QR to intersect PR at R′.
Thus the required triangle.
Hence, this is the answer.