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Finding the Fourth Proportional to 83.11, 124.64 and 54.20

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Solution

The fourth proportional to 83.11, 124.64 and 54.20 is: 81.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.11 : 124.64 = 54.20 : x
  2. Step 2: Convert to fraction form
    83.11/124.64 = 54.20/x
  3. Step 3: Cross multiply
    83.11x = 124.64 × 54.20
  4. Step 4: Simplify right side
    83.11x = 6,755.22
  5. Step 5: Solve for x
    x = 6,755.22/83.11
  6. Step 6: Final answer
    x = 81.29

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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.