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Finding the Fourth Proportional to 80,919,489.60, 121,379,234.40 and 80,415,604.80

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Solution

The fourth proportional to 80,919,489.60, 121,379,234.40 and 80,415,604.80 is: 120,623,407.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,919,489.60 : 121,379,234.40 = 80,415,604.80 : x
  2. Step 2: Convert to fraction form
    80,919,489.60/121,379,234.40 = 80,415,604.80/x
  3. Step 3: Cross multiply
    80,919,489.60x = 121,379,234.40 × 80,415,604.80
  4. Step 4: Simplify right side
    80,919,489.60x = 9,760,784,544,436,966
  5. Step 5: Solve for x
    x = 9,760,784,544,436,966/80,919,489.60
  6. Step 6: Final answer
    x = 120,623,407.20

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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.