Home / 20,121.72-27,768.42-11,169.09

Finding the Fourth Proportional to 20,121.72, 27,768.42 and 11,169.09

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Solution

The fourth proportional to 20,121.72, 27,768.42 and 11,169.09 is: 15,413.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.72 : 27,768.42 = 11,169.09 : x
  2. Step 2: Convert to fraction form
    20,121.72/27,768.42 = 11,169.09/x
  3. Step 3: Cross multiply
    20,121.72x = 27,768.42 × 11,169.09
  4. Step 4: Simplify right side
    20,121.72x = 310,147,982.14
  5. Step 5: Solve for x
    x = 310,147,982.14/20,121.72
  6. Step 6: Final answer
    x = 15,413.59

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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.