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Finding the Fourth Proportional to 81,475.20, 122,212.80 and 68,644.80

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Solution

The fourth proportional to 81,475.20, 122,212.80 and 68,644.80 is: 102,967.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,475.20 : 122,212.80 = 68,644.80 : x
  2. Step 2: Convert to fraction form
    81,475.20/122,212.80 = 68,644.80/x
  3. Step 3: Cross multiply
    81,475.20x = 122,212.80 × 68,644.80
  4. Step 4: Simplify right side
    81,475.20x = 8,389,273,213.44
  5. Step 5: Solve for x
    x = 8,389,273,213.44/81,475.20
  6. Step 6: Final answer
    x = 102,967.20

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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.