Home / 20,141.20-27,791.90-11,188.78

Finding the Fourth Proportional to 20,141.20, 27,791.90 and 11,188.78

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Solution

The fourth proportional to 20,141.20, 27,791.90 and 11,188.78 is: 15,438.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,141.20 : 27,791.90 = 11,188.78 : x
  2. Step 2: Convert to fraction form
    20,141.20/27,791.90 = 11,188.78/x
  3. Step 3: Cross multiply
    20,141.20x = 27,791.90 × 11,188.78
  4. Step 4: Simplify right side
    20,141.20x = 310,957,454.88
  5. Step 5: Solve for x
    x = 310,957,454.88/20,141.20
  6. Step 6: Final answer
    x = 15,438.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.