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Finding the Fourth Proportional to 81,729.92, 122,680.80 and 72,429.60

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Solution

The fourth proportional to 81,729.92, 122,680.80 and 72,429.60 is: 108,720.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,729.92 : 122,680.80 = 72,429.60 : x
  2. Step 2: Convert to fraction form
    81,729.92/122,680.80 = 72,429.60/x
  3. Step 3: Cross multiply
    81,729.92x = 122,680.80 × 72,429.60
  4. Step 4: Simplify right side
    81,729.92x = 8,885,721,271.68
  5. Step 5: Solve for x
    x = 8,885,721,271.68/81,729.92
  6. Step 6: Final answer
    x = 108,720.54

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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.