SOLUTION: The two rectangles are similar find the length of side x the smaller one has a width of 4 and a length of 16 then the enlarged one has a width of 8 and a length of x how would I do

The easy way is to realize that to keep the proportion,
if you double the width, you also have to double the length.

Answer: length = twice 16 or 32.

The harder way (but the only way for harder problems),
is to set up a proportion:



   

Cross-multiply:

   
   
    
    

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You can also set up the proportion this way:   



   

Cross-multiply:

   
   
    
   

Answer: length of larger rectangle = x = 32 




Edwin