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Finding the Fourth Proportional to 80.43, 110.85 and 55.81

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Solution

The fourth proportional to 80.43, 110.85 and 55.81 is: 76.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.43 : 110.85 = 55.81 : x
  2. Step 2: Convert to fraction form
    80.43/110.85 = 55.81/x
  3. Step 3: Cross multiply
    80.43x = 110.85 × 55.81
  4. Step 4: Simplify right side
    80.43x = 6,186.54
  5. Step 5: Solve for x
    x = 6,186.54/80.43
  6. Step 6: Final answer
    x = 76.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.