Home / 20,131.52-27,781.36-11,178.72

Finding the Fourth Proportional to 20,131.52, 27,781.36 and 11,178.72

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Solution

The fourth proportional to 20,131.52, 27,781.36 and 11,178.72 is: 15,426.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.52 : 27,781.36 = 11,178.72 : x
  2. Step 2: Convert to fraction form
    20,131.52/27,781.36 = 11,178.72/x
  3. Step 3: Cross multiply
    20,131.52x = 27,781.36 × 11,178.72
  4. Step 4: Simplify right side
    20,131.52x = 310,560,044.66
  5. Step 5: Solve for x
    x = 310,560,044.66/20,131.52
  6. Step 6: Final answer
    x = 15,426.56

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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.