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Finding the Fourth Proportional to 403.45, 605.24 and 129.61

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Solution

The fourth proportional to 403.45, 605.24 and 129.61 is: 194.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.45 : 605.24 = 129.61 : x
  2. Step 2: Convert to fraction form
    403.45/605.24 = 129.61/x
  3. Step 3: Cross multiply
    403.45x = 605.24 × 129.61
  4. Step 4: Simplify right side
    403.45x = 78,442.13
  5. Step 5: Solve for x
    x = 78,442.13/403.45
  6. Step 6: Final answer
    x = 194.43

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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.