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Finding the Fourth Proportional to 90,760.60, 135,978.90 and 43,910.20

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Solution

The fourth proportional to 90,760.60, 135,978.90 and 43,910.20 is: 65,786.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,760.60 : 135,978.90 = 43,910.20 : x
  2. Step 2: Convert to fraction form
    90,760.60/135,978.90 = 43,910.20/x
  3. Step 3: Cross multiply
    90,760.60x = 135,978.90 × 43,910.20
  4. Step 4: Simplify right side
    90,760.60x = 5,970,860,694.78
  5. Step 5: Solve for x
    x = 5,970,860,694.78/90,760.60
  6. Step 6: Final answer
    x = 65,786.92

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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.