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Finding the Fourth Proportional to 90,747.40, 135,861.90 and 81,416.20

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Solution

The fourth proportional to 90,747.40, 135,861.90 and 81,416.20 is: 121,891.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,747.40 : 135,861.90 = 81,416.20 : x
  2. Step 2: Convert to fraction form
    90,747.40/135,861.90 = 81,416.20/x
  3. Step 3: Cross multiply
    90,747.40x = 135,861.90 × 81,416.20
  4. Step 4: Simplify right side
    90,747.40x = 11,061,359,622.78
  5. Step 5: Solve for x
    x = 11,061,359,622.78/90,747.40
  6. Step 6: Final answer
    x = 121,891.75

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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.