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Finding the Fourth Proportional to 403.42, 605.11 and 129.53

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Solution

The fourth proportional to 403.42, 605.11 and 129.53 is: 194.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.42 : 605.11 = 129.53 : x
  2. Step 2: Convert to fraction form
    403.42/605.11 = 129.53/x
  3. Step 3: Cross multiply
    403.42x = 605.11 × 129.53
  4. Step 4: Simplify right side
    403.42x = 78,379.90
  5. Step 5: Solve for x
    x = 78,379.90/403.42
  6. Step 6: Final answer
    x = 194.29

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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.