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Finding the Fourth Proportional to 18,687,619.20, 28,031,428.80 and 18,435,676.80

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Solution

The fourth proportional to 18,687,619.20, 28,031,428.80 and 18,435,676.80 is: 27,653,515.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687,619.20 : 28,031,428.80 = 18,435,676.80 : x
  2. Step 2: Convert to fraction form
    18,687,619.20/28,031,428.80 = 18,435,676.80/x
  3. Step 3: Cross multiply
    18,687,619.20x = 28,031,428.80 × 18,435,676.80
  4. Step 4: Simplify right side
    18,687,619.20x = 516,778,361,599,011.88
  5. Step 5: Solve for x
    x = 516,778,361,599,011.88/18,687,619.20
  6. Step 6: Final answer
    x = 27,653,515.20

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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.