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Finding the Fourth Proportional to 419,906.28, 629,968 and 120,408.78

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Solution

The fourth proportional to 419,906.28, 629,968 and 120,408.78 is: 180,644.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,906.28 : 629,968 = 120,408.78 : x
  2. Step 2: Convert to fraction form
    419,906.28/629,968 = 120,408.78/x
  3. Step 3: Cross multiply
    419,906.28x = 629,968 × 120,408.78
  4. Step 4: Simplify right side
    419,906.28x = 75,853,678,319.04
  5. Step 5: Solve for x
    x = 75,853,678,319.04/419,906.28
  6. Step 6: Final answer
    x = 180,644.31

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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.