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Finding the Fourth Proportional to 403.68, 605.22 and 129.62

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Solution

The fourth proportional to 403.68, 605.22 and 129.62 is: 194.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.68 : 605.22 = 129.62 : x
  2. Step 2: Convert to fraction form
    403.68/605.22 = 129.62/x
  3. Step 3: Cross multiply
    403.68x = 605.22 × 129.62
  4. Step 4: Simplify right side
    403.68x = 78,445.59
  5. Step 5: Solve for x
    x = 78,445.59/403.68
  6. Step 6: Final answer
    x = 194.33

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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.