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Finding the Fourth Proportional to 81,154.61, 122,285.85 and 66,687.60

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Solution

The fourth proportional to 81,154.61, 122,285.85 and 66,687.60 is: 100,486.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,154.61 : 122,285.85 = 66,687.60 : x
  2. Step 2: Convert to fraction form
    81,154.61/122,285.85 = 66,687.60/x
  3. Step 3: Cross multiply
    81,154.61x = 122,285.85 × 66,687.60
  4. Step 4: Simplify right side
    81,154.61x = 8,154,949,850.46
  5. Step 5: Solve for x
    x = 8,154,949,850.46/81,154.61
  6. Step 6: Final answer
    x = 100,486.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.