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Finding the Fourth Proportional to 18,687.78, 28,033.56 and 5,540.40

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Solution

The fourth proportional to 18,687.78, 28,033.56 and 5,540.40 is: 8,311.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687.78 : 28,033.56 = 5,540.40 : x
  2. Step 2: Convert to fraction form
    18,687.78/28,033.56 = 5,540.40/x
  3. Step 3: Cross multiply
    18,687.78x = 28,033.56 × 5,540.40
  4. Step 4: Simplify right side
    18,687.78x = 155,317,135.82
  5. Step 5: Solve for x
    x = 155,317,135.82/18,687.78
  6. Step 6: Final answer
    x = 8,311.16

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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.