find the unknown length in each pair of similiar firgures

[lynnmarie51]

Help!!!

How do you find the unknown length in a pair of similiar figures

1st triangle 21 cm , 27 cm and 36 cm is on trianle other one is 35 cm and 45 cm wha tis x

 

[Gene]

21/35 = 27/45 = 36/x