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Finding the Fourth Proportional to 403.69, 605.54 and 129.80

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Solution

The fourth proportional to 403.69, 605.54 and 129.80 is: 194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.69 : 605.54 = 129.80 : x
  2. Step 2: Convert to fraction form
    403.69/605.54 = 129.80/x
  3. Step 3: Cross multiply
    403.69x = 605.54 × 129.80
  4. Step 4: Simplify right side
    403.69x = 78,600.93
  5. Step 5: Solve for x
    x = 78,600.93/403.69
  6. Step 6: Final answer
    x = 194.71

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.