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Finding the Fourth Proportional to 83.18, 124.10 and 81.68

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Solution

The fourth proportional to 83.18, 124.10 and 81.68 is: 121.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.18 : 124.10 = 81.68 : x
  2. Step 2: Convert to fraction form
    83.18/124.10 = 81.68/x
  3. Step 3: Cross multiply
    83.18x = 124.10 × 81.68
  4. Step 4: Simplify right side
    83.18x = 10,136.49
  5. Step 5: Solve for x
    x = 10,136.49/83.18
  6. Step 6: Final answer
    x = 121.86

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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.