Home / 20,839.11-28,757.77-11,278.80

Finding the Fourth Proportional to 20,839.11, 28,757.77 and 11,278.80

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Solution

The fourth proportional to 20,839.11, 28,757.77 and 11,278.80 is: 15,564.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.11 : 28,757.77 = 11,278.80 : x
  2. Step 2: Convert to fraction form
    20,839.11/28,757.77 = 11,278.80/x
  3. Step 3: Cross multiply
    20,839.11x = 28,757.77 × 11,278.80
  4. Step 4: Simplify right side
    20,839.11x = 324,353,171.52
  5. Step 5: Solve for x
    x = 324,353,171.52/20,839.11
  6. Step 6: Final answer
    x = 15,564.64

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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.