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Finding the Fourth Proportional to 81,285.80, 121,691.10 and 57,957.80

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Solution

The fourth proportional to 81,285.80, 121,691.10 and 57,957.80 is: 86,767.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,285.80 : 121,691.10 = 57,957.80 : x
  2. Step 2: Convert to fraction form
    81,285.80/121,691.10 = 57,957.80/x
  3. Step 3: Cross multiply
    81,285.80x = 121,691.10 × 57,957.80
  4. Step 4: Simplify right side
    81,285.80x = 7,052,948,435.58
  5. Step 5: Solve for x
    x = 7,052,948,435.58/81,285.80
  6. Step 6: Final answer
    x = 86,767.29

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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.