Home / 13,917.90-20,876.80-3,387.80

Finding the Fourth Proportional to 13,917.90, 20,876.80 and 3,387.80

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Solution

The fourth proportional to 13,917.90, 20,876.80 and 3,387.80 is: 5,081.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,917.90 : 20,876.80 = 3,387.80 : x
  2. Step 2: Convert to fraction form
    13,917.90/20,876.80 = 3,387.80/x
  3. Step 3: Cross multiply
    13,917.90x = 20,876.80 × 3,387.80
  4. Step 4: Simplify right side
    13,917.90x = 70,726,423.04
  5. Step 5: Solve for x
    x = 70,726,423.04/13,917.90
  6. Step 6: Final answer
    x = 5,081.69

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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.