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Finding the Fourth Proportional to 403.59, 605.21 and 129.61

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Solution

The fourth proportional to 403.59, 605.21 and 129.61 is: 194.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.59 : 605.21 = 129.61 : x
  2. Step 2: Convert to fraction form
    403.59/605.21 = 129.61/x
  3. Step 3: Cross multiply
    403.59x = 605.21 × 129.61
  4. Step 4: Simplify right side
    403.59x = 78,437.59
  5. Step 5: Solve for x
    x = 78,437.59/403.59
  6. Step 6: Final answer
    x = 194.35

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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.