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Finding the Fourth Proportional to 129.48, 178.62 and 80.42

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Solution

The fourth proportional to 129.48, 178.62 and 80.42 is: 110.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.48 : 178.62 = 80.42 : x
  2. Step 2: Convert to fraction form
    129.48/178.62 = 80.42/x
  3. Step 3: Cross multiply
    129.48x = 178.62 × 80.42
  4. Step 4: Simplify right side
    129.48x = 14,363.73
  5. Step 5: Solve for x
    x = 14,363.73/129.48
  6. Step 6: Final answer
    x = 110.93

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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.