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Finding the Fourth Proportional to 80.47, 120.74 and 43.87

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Solution

The fourth proportional to 80.47, 120.74 and 43.87 is: 65.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.47 : 120.74 = 43.87 : x
  2. Step 2: Convert to fraction form
    80.47/120.74 = 43.87/x
  3. Step 3: Cross multiply
    80.47x = 120.74 × 43.87
  4. Step 4: Simplify right side
    80.47x = 5,296.26
  5. Step 5: Solve for x
    x = 5,296.26/80.47
  6. Step 6: Final answer
    x = 65.82

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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.