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Finding the Fourth Proportional to 90,156, 135,073.62 and 76,873.62

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Solution

The fourth proportional to 90,156, 135,073.62 and 76,873.62 is: 115,173.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,156 : 135,073.62 = 76,873.62 : x
  2. Step 2: Convert to fraction form
    90,156/135,073.62 = 76,873.62/x
  3. Step 3: Cross multiply
    90,156x = 135,073.62 × 76,873.62
  4. Step 4: Simplify right side
    90,156x = 10,383,598,135.90
  5. Step 5: Solve for x
    x = 10,383,598,135.90/90,156
  6. Step 6: Final answer
    x = 115,173.68

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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.