Triangle XYZXYZX, Y, Z is similar to triangle PQRPQRP, Q, R.
Solve for kkk.
k=k=k, equals
Two triangles P Q R and X Y Z. Side P Q is six point five. Side Q R is k. Side R P is five point five. Side X Y is nineteen point five. Side Y Z is ten point five. Side Z X is sixteen point five.