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Finding the Fourth Proportional to 78,469.43, 108,289.94 and 42,661.90

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Solution

The fourth proportional to 78,469.43, 108,289.94 and 42,661.90 is: 58,874.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,469.43 : 108,289.94 = 42,661.90 : x
  2. Step 2: Convert to fraction form
    78,469.43/108,289.94 = 42,661.90/x
  3. Step 3: Cross multiply
    78,469.43x = 108,289.94 × 42,661.90
  4. Step 4: Simplify right side
    78,469.43x = 4,619,853,836.53
  5. Step 5: Solve for x
    x = 4,619,853,836.53/78,469.43
  6. Step 6: Final answer
    x = 58,874.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.