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Finding the Fourth Proportional to 81,356.60, 122,034.90 and 41,990.60

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Solution

The fourth proportional to 81,356.60, 122,034.90 and 41,990.60 is: 62,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,356.60 : 122,034.90 = 41,990.60 : x
  2. Step 2: Convert to fraction form
    81,356.60/122,034.90 = 41,990.60/x
  3. Step 3: Cross multiply
    81,356.60x = 122,034.90 × 41,990.60
  4. Step 4: Simplify right side
    81,356.60x = 5,124,318,671.94
  5. Step 5: Solve for x
    x = 5,124,318,671.94/81,356.60
  6. Step 6: Final answer
    x = 62,985.90

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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.