Question 420760
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Hi
Let x represent width in inches of the similar triangle
Question Sets Up the Proportion
{{{5/3 = 45/x}}}     | Cross Multiplying 
  5x = 3*45
   x = 3*45/5
   x = 27in, width in inches of the similar triangle

CHECKING our Answer***
 5/3 = 45/27 = 5/3