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Finding the Fourth Proportional to 83.11, 124.61 and 42.47

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Solution

The fourth proportional to 83.11, 124.61 and 42.47 is: 63.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.11 : 124.61 = 42.47 : x
  2. Step 2: Convert to fraction form
    83.11/124.61 = 42.47/x
  3. Step 3: Cross multiply
    83.11x = 124.61 × 42.47
  4. Step 4: Simplify right side
    83.11x = 5,291.97
  5. Step 5: Solve for x
    x = 5,291.97/83.11
  6. Step 6: Final answer
    x = 63.68

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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.