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Finding the Fourth Proportional to 13,919.39, 20,879.08 and 3,389.41

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Solution

The fourth proportional to 13,919.39, 20,879.08 and 3,389.41 is: 5,084.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.39 : 20,879.08 = 3,389.41 : x
  2. Step 2: Convert to fraction form
    13,919.39/20,879.08 = 3,389.41/x
  3. Step 3: Cross multiply
    13,919.39x = 20,879.08 × 3,389.41
  4. Step 4: Simplify right side
    13,919.39x = 70,767,641.20
  5. Step 5: Solve for x
    x = 70,767,641.20/13,919.39
  6. Step 6: Final answer
    x = 5,084.11

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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.