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Finding the Fourth Proportional to 19,993,661.20, 29,990,491.80 and 19,209,840.40

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Solution

The fourth proportional to 19,993,661.20, 29,990,491.80 and 19,209,840.40 is: 28,814,760.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,993,661.20 : 29,990,491.80 = 19,209,840.40 : x
  2. Step 2: Convert to fraction form
    19,993,661.20/29,990,491.80 = 19,209,840.40/x
  3. Step 3: Cross multiply
    19,993,661.20x = 29,990,491.80 × 19,209,840.40
  4. Step 4: Simplify right side
    19,993,661.20x = 576,112,560,995,508.75
  5. Step 5: Solve for x
    x = 576,112,560,995,508.75/19,993,661.20
  6. Step 6: Final answer
    x = 28,814,760.60

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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.