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Finding the Fourth Proportional to 72.53, 108.75 and 55.16

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Solution

The fourth proportional to 72.53, 108.75 and 55.16 is: 82.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.53 : 108.75 = 55.16 : x
  2. Step 2: Convert to fraction form
    72.53/108.75 = 55.16/x
  3. Step 3: Cross multiply
    72.53x = 108.75 × 55.16
  4. Step 4: Simplify right side
    72.53x = 5,998.72
  5. Step 5: Solve for x
    x = 5,998.72/72.53
  6. Step 6: Final answer
    x = 82.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.