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Finding the Fourth Proportional to 18,689,993.20, 28,019,243.40 and 9,714,545.20

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Solution

The fourth proportional to 18,689,993.20, 28,019,243.40 and 9,714,545.20 is: 14,563,633.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689,993.20 : 28,019,243.40 = 9,714,545.20 : x
  2. Step 2: Convert to fraction form
    18,689,993.20/28,019,243.40 = 9,714,545.20/x
  3. Step 3: Cross multiply
    18,689,993.20x = 28,019,243.40 × 9,714,545.20
  4. Step 4: Simplify right side
    18,689,993.20x = 272,194,206,479,101.66
  5. Step 5: Solve for x
    x = 272,194,206,479,101.66/18,689,993.20
  6. Step 6: Final answer
    x = 14,563,633.25

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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.