Home / 20,138.76-27,791.84-11,187.09

Finding the Fourth Proportional to 20,138.76, 27,791.84 and 11,187.09

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Solution

The fourth proportional to 20,138.76, 27,791.84 and 11,187.09 is: 15,438.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.76 : 27,791.84 = 11,187.09 : x
  2. Step 2: Convert to fraction form
    20,138.76/27,791.84 = 11,187.09/x
  3. Step 3: Cross multiply
    20,138.76x = 27,791.84 × 11,187.09
  4. Step 4: Simplify right side
    20,138.76x = 310,909,815.35
  5. Step 5: Solve for x
    x = 310,909,815.35/20,138.76
  6. Step 6: Final answer
    x = 15,438.38

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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.