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Finding the Fourth Proportional to 403.91, 605.91 and 129.90

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Solution

The fourth proportional to 403.91, 605.91 and 129.90 is: 194.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.91 : 605.91 = 129.90 : x
  2. Step 2: Convert to fraction form
    403.91/605.91 = 129.90/x
  3. Step 3: Cross multiply
    403.91x = 605.91 × 129.90
  4. Step 4: Simplify right side
    403.91x = 78,709.22
  5. Step 5: Solve for x
    x = 78,709.22/403.91
  6. Step 6: Final answer
    x = 194.87

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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.