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Finding the Fourth Proportional to 13,909.78, 20,867.78 and 4,422.64

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Solution

The fourth proportional to 13,909.78, 20,867.78 and 4,422.64 is: 6,634.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,909.78 : 20,867.78 = 4,422.64 : x
  2. Step 2: Convert to fraction form
    13,909.78/20,867.78 = 4,422.64/x
  3. Step 3: Cross multiply
    13,909.78x = 20,867.78 × 4,422.64
  4. Step 4: Simplify right side
    13,909.78x = 92,290,622.33
  5. Step 5: Solve for x
    x = 92,290,622.33/13,909.78
  6. Step 6: Final answer
    x = 6,634.95

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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.