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Finding the Fourth Proportional to 11,940.48, 17,939.70 and 10,540.80

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Solution

The fourth proportional to 11,940.48, 17,939.70 and 10,540.80 is: 15,836.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,940.48 : 17,939.70 = 10,540.80 : x
  2. Step 2: Convert to fraction form
    11,940.48/17,939.70 = 10,540.80/x
  3. Step 3: Cross multiply
    11,940.48x = 17,939.70 × 10,540.80
  4. Step 4: Simplify right side
    11,940.48x = 189,098,789.76
  5. Step 5: Solve for x
    x = 189,098,789.76/11,940.48
  6. Step 6: Final answer
    x = 15,836.78

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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.