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Finding the Fourth Proportional to 81,619.20, 122,428.80 and 72,433.80

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Solution

The fourth proportional to 81,619.20, 122,428.80 and 72,433.80 is: 108,650.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,619.20 : 122,428.80 = 72,433.80 : x
  2. Step 2: Convert to fraction form
    81,619.20/122,428.80 = 72,433.80/x
  3. Step 3: Cross multiply
    81,619.20x = 122,428.80 × 72,433.80
  4. Step 4: Simplify right side
    81,619.20x = 8,867,983,213.44
  5. Step 5: Solve for x
    x = 8,867,983,213.44/81,619.20
  6. Step 6: Final answer
    x = 108,650.70

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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.