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Finding the Fourth Proportional to 403.92, 605.70 and 129.96

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Solution

The fourth proportional to 403.92, 605.70 and 129.96 is: 194.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.92 : 605.70 = 129.96 : x
  2. Step 2: Convert to fraction form
    403.92/605.70 = 129.96/x
  3. Step 3: Cross multiply
    403.92x = 605.70 × 129.96
  4. Step 4: Simplify right side
    403.92x = 78,716.77
  5. Step 5: Solve for x
    x = 78,716.77/403.92
  6. Step 6: Final answer
    x = 194.88

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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.