Home / 13,620.90-20,431.38-3,759.96

Finding the Fourth Proportional to 13,620.90, 20,431.38 and 3,759.96

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Solution

The fourth proportional to 13,620.90, 20,431.38 and 3,759.96 is: 5,639.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.90 : 20,431.38 = 3,759.96 : x
  2. Step 2: Convert to fraction form
    13,620.90/20,431.38 = 3,759.96/x
  3. Step 3: Cross multiply
    13,620.90x = 20,431.38 × 3,759.96
  4. Step 4: Simplify right side
    13,620.90x = 76,821,171.54
  5. Step 5: Solve for x
    x = 76,821,171.54/13,620.90
  6. Step 6: Final answer
    x = 5,639.95

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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.