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Finding the Fourth Proportional to 499.61, 748.81 and 280.11

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Solution

The fourth proportional to 499.61, 748.81 and 280.11 is: 419.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.61 : 748.81 = 280.11 : x
  2. Step 2: Convert to fraction form
    499.61/748.81 = 280.11/x
  3. Step 3: Cross multiply
    499.61x = 748.81 × 280.11
  4. Step 4: Simplify right side
    499.61x = 209,749.17
  5. Step 5: Solve for x
    x = 209,749.17/499.61
  6. Step 6: Final answer
    x = 419.83

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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.