Finding the Third Proportional to 111.50 and 272

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 272 = 272 : x
2. Step 2: Convert to fraction form
   111.50/272 = 272/x
3. Step 3: Cross multiply
   111.50x = 272 × 272
4. Step 4: Simplify right side
   111.50x = 73,984
5. Step 5: Solve for x
   x = 73,984/111.50
6. Step 6: Final answer
   x = 663.53