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Finding the Fourth Proportional to 18,793,807.80, 28,190,711.70 and 12,821,839.80

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Solution

The fourth proportional to 18,793,807.80, 28,190,711.70 and 12,821,839.80 is: 19,232,759.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,793,807.80 : 28,190,711.70 = 12,821,839.80 : x
  2. Step 2: Convert to fraction form
    18,793,807.80/28,190,711.70 = 12,821,839.80/x
  3. Step 3: Cross multiply
    18,793,807.80x = 28,190,711.70 × 12,821,839.80
  4. Step 4: Simplify right side
    18,793,807.80x = 361,456,789,265,385.69
  5. Step 5: Solve for x
    x = 361,456,789,265,385.69/18,793,807.80
  6. Step 6: Final answer
    x = 19,232,759.70

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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.