For this case we have the following fraction: 
 

 To write three equivalent fractions, what we must do is multiply the numerator and the denominator of the expression by the same factor. 
 We have then:
 For k = 3:
 

 For k = 5:
 

 For k = 2:
 

 Answer: 
 the three equivalent ratio of 5/7 are:
 

 

 
