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Finding the Fourth Proportional to 13,879.52, 20,824.16 and 8,679.36

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Solution

The fourth proportional to 13,879.52, 20,824.16 and 8,679.36 is: 13,022.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.52 : 20,824.16 = 8,679.36 : x
  2. Step 2: Convert to fraction form
    13,879.52/20,824.16 = 8,679.36/x
  3. Step 3: Cross multiply
    13,879.52x = 20,824.16 × 8,679.36
  4. Step 4: Simplify right side
    13,879.52x = 180,740,381.34
  5. Step 5: Solve for x
    x = 180,740,381.34/13,879.52
  6. Step 6: Final answer
    x = 13,022.09

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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.