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Finding the Fourth Proportional to 18,689,722.20, 27,978,596.10 and 11,112,787.80

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Solution

The fourth proportional to 18,689,722.20, 27,978,596.10 and 11,112,787.80 is: 16,635,892.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689,722.20 : 27,978,596.10 = 11,112,787.80 : x
  2. Step 2: Convert to fraction form
    18,689,722.20/27,978,596.10 = 11,112,787.80/x
  3. Step 3: Cross multiply
    18,689,722.20x = 27,978,596.10 × 11,112,787.80
  4. Step 4: Simplify right side
    18,689,722.20x = 310,920,201,401,207.62
  5. Step 5: Solve for x
    x = 310,920,201,401,207.62/18,689,722.20
  6. Step 6: Final answer
    x = 16,635,892.07

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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.