Home / 20,139.12-27,791.91-11,187.90

Finding the Fourth Proportional to 20,139.12, 27,791.91 and 11,187.90

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Solution

The fourth proportional to 20,139.12, 27,791.91 and 11,187.90 is: 15,439.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.12 : 27,791.91 = 11,187.90 : x
  2. Step 2: Convert to fraction form
    20,139.12/27,791.91 = 11,187.90/x
  3. Step 3: Cross multiply
    20,139.12x = 27,791.91 × 11,187.90
  4. Step 4: Simplify right side
    20,139.12x = 310,933,109.89
  5. Step 5: Solve for x
    x = 310,933,109.89/20,139.12
  6. Step 6: Final answer
    x = 15,439.26

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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.