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Finding the Fourth Proportional to 54.57, 81.17 and 54.39

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Solution

The fourth proportional to 54.57, 81.17 and 54.39 is: 80.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.57 : 81.17 = 54.39 : x
  2. Step 2: Convert to fraction form
    54.57/81.17 = 54.39/x
  3. Step 3: Cross multiply
    54.57x = 81.17 × 54.39
  4. Step 4: Simplify right side
    54.57x = 4,414.97
  5. Step 5: Solve for x
    x = 4,414.97/54.57
  6. Step 6: Final answer
    x = 80.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.