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Finding the Fourth Proportional to 81,025.60, 121,392.60 and 68,486.80

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Solution

The fourth proportional to 81,025.60, 121,392.60 and 68,486.80 is: 102,606.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,025.60 : 121,392.60 = 68,486.80 : x
  2. Step 2: Convert to fraction form
    81,025.60/121,392.60 = 68,486.80/x
  3. Step 3: Cross multiply
    81,025.60x = 121,392.60 × 68,486.80
  4. Step 4: Simplify right side
    81,025.60x = 8,313,790,717.68
  5. Step 5: Solve for x
    x = 8,313,790,717.68/81,025.60
  6. Step 6: Final answer
    x = 102,606.96

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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.