Home / 20,131.20-27,778.10-11,178.78

Finding the Fourth Proportional to 20,131.20, 27,778.10 and 11,178.78

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Solution

The fourth proportional to 20,131.20, 27,778.10 and 11,178.78 is: 15,425.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.20 : 27,778.10 = 11,178.78 : x
  2. Step 2: Convert to fraction form
    20,131.20/27,778.10 = 11,178.78/x
  3. Step 3: Cross multiply
    20,131.20x = 27,778.10 × 11,178.78
  4. Step 4: Simplify right side
    20,131.20x = 310,525,268.72
  5. Step 5: Solve for x
    x = 310,525,268.72/20,131.20
  6. Step 6: Final answer
    x = 15,425.07

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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.