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Finding the Fourth Proportional to 12,469,661.20, 18,704,491.80 and 11,776,819.60

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Solution

The fourth proportional to 12,469,661.20, 18,704,491.80 and 11,776,819.60 is: 17,665,229.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,469,661.20 : 18,704,491.80 = 11,776,819.60 : x
  2. Step 2: Convert to fraction form
    12,469,661.20/18,704,491.80 = 11,776,819.60/x
  3. Step 3: Cross multiply
    12,469,661.20x = 18,704,491.80 × 11,776,819.60
  4. Step 4: Simplify right side
    12,469,661.20x = 220,279,425,638,279.28
  5. Step 5: Solve for x
    x = 220,279,425,638,279.28/12,469,661.20
  6. Step 6: Final answer
    x = 17,665,229.40

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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.