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Finding the Fourth Proportional to 21,027.44, 31,540.80 and 9,939.44

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Solution

The fourth proportional to 21,027.44, 31,540.80 and 9,939.44 is: 14,908.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,027.44 : 31,540.80 = 9,939.44 : x
  2. Step 2: Convert to fraction form
    21,027.44/31,540.80 = 9,939.44/x
  3. Step 3: Cross multiply
    21,027.44x = 31,540.80 × 9,939.44
  4. Step 4: Simplify right side
    21,027.44x = 313,497,889.15
  5. Step 5: Solve for x
    x = 313,497,889.15/21,027.44
  6. Step 6: Final answer
    x = 14,908.99

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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.