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Finding the Fourth Proportional to 80.11, 119.41 and 71.39

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Solution

The fourth proportional to 80.11, 119.41 and 71.39 is: 106.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.11 : 119.41 = 71.39 : x
  2. Step 2: Convert to fraction form
    80.11/119.41 = 71.39/x
  3. Step 3: Cross multiply
    80.11x = 119.41 × 71.39
  4. Step 4: Simplify right side
    80.11x = 8,524.38
  5. Step 5: Solve for x
    x = 8,524.38/80.11
  6. Step 6: Final answer
    x = 106.41

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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.