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Finding the Fourth Proportional to 21,784,138.60, 32,676,207.90 and 20,792,115.40

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Solution

The fourth proportional to 21,784,138.60, 32,676,207.90 and 20,792,115.40 is: 31,188,173.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,784,138.60 : 32,676,207.90 = 20,792,115.40 : x
  2. Step 2: Convert to fraction form
    21,784,138.60/32,676,207.90 = 20,792,115.40/x
  3. Step 3: Cross multiply
    21,784,138.60x = 32,676,207.90 × 20,792,115.40
  4. Step 4: Simplify right side
    21,784,138.60x = 679,407,485,491,191.62
  5. Step 5: Solve for x
    x = 679,407,485,491,191.62/21,784,138.60
  6. Step 6: Final answer
    x = 31,188,173.10

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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.