In the diagram, PQ¯¯¯¯¯¯¯¯ is tangent to the circle at point Q, and secant PS¯¯¯¯¯¯¯ intersects the circle at points R and S. The lines intersect outside the circle at point P.
A circle with no center shown. Points S, R, and Q lie on the circle. Secant P S and tangent P Q are described in the text. Segment R S equals 5 and segment P R equals 4.

What is the length of PQ¯¯¯¯¯¯¯¯?
Enter the correct value.