Home / 20,131.27-27,781.21-11,178.79

Finding the Fourth Proportional to 20,131.27, 27,781.21 and 11,178.79

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Solution

The fourth proportional to 20,131.27, 27,781.21 and 11,178.79 is: 15,426.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.27 : 27,781.21 = 11,178.79 : x
  2. Step 2: Convert to fraction form
    20,131.27/27,781.21 = 11,178.79/x
  3. Step 3: Cross multiply
    20,131.27x = 27,781.21 × 11,178.79
  4. Step 4: Simplify right side
    20,131.27x = 310,560,350.44
  5. Step 5: Solve for x
    x = 310,560,350.44/20,131.27
  6. Step 6: Final answer
    x = 15,426.77

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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.