Home / 20,138.38-27,789.84-11,185.66

Finding the Fourth Proportional to 20,138.38, 27,789.84 and 11,185.66

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Solution

The fourth proportional to 20,138.38, 27,789.84 and 11,185.66 is: 15,435.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.38 : 27,789.84 = 11,185.66 : x
  2. Step 2: Convert to fraction form
    20,138.38/27,789.84 = 11,185.66/x
  3. Step 3: Cross multiply
    20,138.38x = 27,789.84 × 11,185.66
  4. Step 4: Simplify right side
    20,138.38x = 310,847,701.69
  5. Step 5: Solve for x
    x = 310,847,701.69/20,138.38
  6. Step 6: Final answer
    x = 15,435.59

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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.