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Finding the Fourth Proportional to 80.66, 120.11 and 75.47

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Solution

The fourth proportional to 80.66, 120.11 and 75.47 is: 112.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.66 : 120.11 = 75.47 : x
  2. Step 2: Convert to fraction form
    80.66/120.11 = 75.47/x
  3. Step 3: Cross multiply
    80.66x = 120.11 × 75.47
  4. Step 4: Simplify right side
    80.66x = 9,064.10
  5. Step 5: Solve for x
    x = 9,064.10/80.66
  6. Step 6: Final answer
    x = 112.38

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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.