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Finding the Fourth Proportional to 90,639.20, 135,958.80 and 81,453.80

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Solution

The fourth proportional to 90,639.20, 135,958.80 and 81,453.80 is: 122,180.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639.20 : 135,958.80 = 81,453.80 : x
  2. Step 2: Convert to fraction form
    90,639.20/135,958.80 = 81,453.80/x
  3. Step 3: Cross multiply
    90,639.20x = 135,958.80 × 81,453.80
  4. Step 4: Simplify right side
    90,639.20x = 11,074,360,903.44
  5. Step 5: Solve for x
    x = 11,074,360,903.44/90,639.20
  6. Step 6: Final answer
    x = 122,180.70

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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.