Home / 13,940.20-20,913.30-4,078.72

Finding the Fourth Proportional to 13,940.20, 20,913.30 and 4,078.72

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Solution

The fourth proportional to 13,940.20, 20,913.30 and 4,078.72 is: 6,118.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,940.20 : 20,913.30 = 4,078.72 : x
  2. Step 2: Convert to fraction form
    13,940.20/20,913.30 = 4,078.72/x
  3. Step 3: Cross multiply
    13,940.20x = 20,913.30 × 4,078.72
  4. Step 4: Simplify right side
    13,940.20x = 85,299,494.98
  5. Step 5: Solve for x
    x = 85,299,494.98/13,940.20
  6. Step 6: Final answer
    x = 6,118.96

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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.