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Finding the Fourth Proportional to 66.92, 100.15 and 55.37

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Solution

The fourth proportional to 66.92, 100.15 and 55.37 is: 82.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.92 : 100.15 = 55.37 : x
  2. Step 2: Convert to fraction form
    66.92/100.15 = 55.37/x
  3. Step 3: Cross multiply
    66.92x = 100.15 × 55.37
  4. Step 4: Simplify right side
    66.92x = 5,545.42
  5. Step 5: Solve for x
    x = 5,545.42/66.92
  6. Step 6: Final answer
    x = 82.87

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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.