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Finding the Fourth Proportional to 71.20, 106.73 and 38.66

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Solution

The fourth proportional to 71.20, 106.73 and 38.66 is: 57.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.20 : 106.73 = 38.66 : x
  2. Step 2: Convert to fraction form
    71.20/106.73 = 38.66/x
  3. Step 3: Cross multiply
    71.20x = 106.73 × 38.66
  4. Step 4: Simplify right side
    71.20x = 4,126.70
  5. Step 5: Solve for x
    x = 4,126.70/71.20
  6. Step 6: Final answer
    x = 57.96

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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.