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Finding the Fourth Proportional to 20,081.91, 27,713.03 and 11,129.99

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Solution

The fourth proportional to 20,081.91, 27,713.03 and 11,129.99 is: 15,359.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.91 : 27,713.03 = 11,129.99 : x
  2. Step 2: Convert to fraction form
    20,081.91/27,713.03 = 11,129.99/x
  3. Step 3: Cross multiply
    20,081.91x = 27,713.03 × 11,129.99
  4. Step 4: Simplify right side
    20,081.91x = 308,445,757.59
  5. Step 5: Solve for x
    x = 308,445,757.59/20,081.91
  6. Step 6: Final answer
    x = 15,359.38

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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.