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Finding the Fourth Proportional to 403.72, 605.56 and 129.81

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Solution

The fourth proportional to 403.72, 605.56 and 129.81 is: 194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.72 : 605.56 = 129.81 : x
  2. Step 2: Convert to fraction form
    403.72/605.56 = 129.81/x
  3. Step 3: Cross multiply
    403.72x = 605.56 × 129.81
  4. Step 4: Simplify right side
    403.72x = 78,607.74
  5. Step 5: Solve for x
    x = 78,607.74/403.72
  6. Step 6: Final answer
    x = 194.71

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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.