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Finding the Fourth Proportional to 83.98, 125.42 and 76.42

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Solution

The fourth proportional to 83.98, 125.42 and 76.42 is: 114.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.98 : 125.42 = 76.42 : x
  2. Step 2: Convert to fraction form
    83.98/125.42 = 76.42/x
  3. Step 3: Cross multiply
    83.98x = 125.42 × 76.42
  4. Step 4: Simplify right side
    83.98x = 9,583.97
  5. Step 5: Solve for x
    x = 9,583.97/83.98
  6. Step 6: Final answer
    x = 114.13

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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.