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Finding the Fourth Proportional to 418.56, 627.66 and 129.92

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Solution

The fourth proportional to 418.56, 627.66 and 129.92 is: 194.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.56 : 627.66 = 129.92 : x
  2. Step 2: Convert to fraction form
    418.56/627.66 = 129.92/x
  3. Step 3: Cross multiply
    418.56x = 627.66 × 129.92
  4. Step 4: Simplify right side
    418.56x = 81,545.59
  5. Step 5: Solve for x
    x = 81,545.59/418.56
  6. Step 6: Final answer
    x = 194.82

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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.