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Finding the Fourth Proportional to 13,781.28, 20,672.31 and 3,393

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Solution

The fourth proportional to 13,781.28, 20,672.31 and 3,393 is: 5,089.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.28 : 20,672.31 = 3,393 : x
  2. Step 2: Convert to fraction form
    13,781.28/20,672.31 = 3,393/x
  3. Step 3: Cross multiply
    13,781.28x = 20,672.31 × 3,393
  4. Step 4: Simplify right side
    13,781.28x = 70,141,147.83
  5. Step 5: Solve for x
    x = 70,141,147.83/13,781.28
  6. Step 6: Final answer
    x = 5,089.60

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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.