tolong yaa secepatnya+caranya terimakasih..

[tex] \frac{4}{sin P} = \frac{5}{sin Q} = \frac{7}{sin R} [/tex]
[tex] \frac{4}{sin P} = \frac{7}{sin R} [/tex]
[tex] 4sin R = 7sin P [/tex]
[tex] \frac{4}{7}sin R = sin P [/tex]