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Finding the Fourth Proportional to 80,753,978.20, 120,963,005.70 and 67,317,050.20

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Solution

The fourth proportional to 80,753,978.20, 120,963,005.70 and 67,317,050.20 is: 100,835,561.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,753,978.20 : 120,963,005.70 = 67,317,050.20 : x
  2. Step 2: Convert to fraction form
    80,753,978.20/120,963,005.70 = 67,317,050.20/x
  3. Step 3: Cross multiply
    80,753,978.20x = 120,963,005.70 × 67,317,050.20
  4. Step 4: Simplify right side
    80,753,978.20x = 8,142,872,727,049,787
  5. Step 5: Solve for x
    x = 8,142,872,727,049,787/80,753,978.20
  6. Step 6: Final answer
    x = 100,835,561.40

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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.