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Finding the Fourth Proportional to 18,689,729.20, 27,978,606.60 and 11,112,794.80

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Solution

The fourth proportional to 18,689,729.20, 27,978,606.60 and 11,112,794.80 is: 16,635,902.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689,729.20 : 27,978,606.60 = 11,112,794.80 : x
  2. Step 2: Convert to fraction form
    18,689,729.20/27,978,606.60 = 11,112,794.80/x
  3. Step 3: Cross multiply
    18,689,729.20x = 27,978,606.60 × 11,112,794.80
  4. Step 4: Simplify right side
    18,689,729.20x = 310,920,513,935,725.69
  5. Step 5: Solve for x
    x = 310,920,513,935,725.69/18,689,729.20
  6. Step 6: Final answer
    x = 16,635,902.56

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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.