Home / 20,091.78-27,726.62-11,139.06

Finding the Fourth Proportional to 20,091.78, 27,726.62 and 11,139.06

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Solution

The fourth proportional to 20,091.78, 27,726.62 and 11,139.06 is: 15,371.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,091.78 : 27,726.62 = 11,139.06 : x
  2. Step 2: Convert to fraction form
    20,091.78/27,726.62 = 11,139.06/x
  3. Step 3: Cross multiply
    20,091.78x = 27,726.62 × 11,139.06
  4. Step 4: Simplify right side
    20,091.78x = 308,848,483.78
  5. Step 5: Solve for x
    x = 308,848,483.78/20,091.78
  6. Step 6: Final answer
    x = 15,371.88

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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.