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Finding the Fourth Proportional to 81,856.80, 122,785.20 and 81,273.60

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Solution

The fourth proportional to 81,856.80, 122,785.20 and 81,273.60 is: 121,910.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,856.80 : 122,785.20 = 81,273.60 : x
  2. Step 2: Convert to fraction form
    81,856.80/122,785.20 = 81,273.60/x
  3. Step 3: Cross multiply
    81,856.80x = 122,785.20 × 81,273.60
  4. Step 4: Simplify right side
    81,856.80x = 9,979,195,230.72
  5. Step 5: Solve for x
    x = 9,979,195,230.72/81,856.80
  6. Step 6: Final answer
    x = 121,910.40

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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.