Home / 20,131.81-27,780.96-11,179.88

Finding the Fourth Proportional to 20,131.81, 27,780.96 and 11,179.88

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Solution

The fourth proportional to 20,131.81, 27,780.96 and 11,179.88 is: 15,427.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.81 : 27,780.96 = 11,179.88 : x
  2. Step 2: Convert to fraction form
    20,131.81/27,780.96 = 11,179.88/x
  3. Step 3: Cross multiply
    20,131.81x = 27,780.96 × 11,179.88
  4. Step 4: Simplify right side
    20,131.81x = 310,587,799.08
  5. Step 5: Solve for x
    x = 310,587,799.08/20,131.81
  6. Step 6: Final answer
    x = 15,427.72

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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.