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Finding the Fourth Proportional to 20,656,882.80, 30,985,324.20 and 18,389,401.20

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Solution

The fourth proportional to 20,656,882.80, 30,985,324.20 and 18,389,401.20 is: 27,584,101.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656,882.80 : 30,985,324.20 = 18,389,401.20 : x
  2. Step 2: Convert to fraction form
    20,656,882.80/30,985,324.20 = 18,389,401.20/x
  3. Step 3: Cross multiply
    20,656,882.80x = 30,985,324.20 × 18,389,401.20
  4. Step 4: Simplify right side
    20,656,882.80x = 569,801,558,025,869
  5. Step 5: Solve for x
    x = 569,801,558,025,869/20,656,882.80
  6. Step 6: Final answer
    x = 27,584,101.80

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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.