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Finding the Fourth Proportional to 427,881.75, 641,923.85 and 139,691.85

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Solution

The fourth proportional to 427,881.75, 641,923.85 and 139,691.85 is: 209,570.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,881.75 : 641,923.85 = 139,691.85 : x
  2. Step 2: Convert to fraction form
    427,881.75/641,923.85 = 139,691.85/x
  3. Step 3: Cross multiply
    427,881.75x = 641,923.85 × 139,691.85
  4. Step 4: Simplify right side
    427,881.75x = 89,671,530,165.62
  5. Step 5: Solve for x
    x = 89,671,530,165.62/427,881.75
  6. Step 6: Final answer
    x = 209,570.82

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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.