Home / 20,789.24-28,679.16-15,115.20

Finding the Fourth Proportional to 20,789.24, 28,679.16 and 15,115.20

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Solution

The fourth proportional to 20,789.24, 28,679.16 and 15,115.20 is: 20,851.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.24 : 28,679.16 = 15,115.20 : x
  2. Step 2: Convert to fraction form
    20,789.24/28,679.16 = 15,115.20/x
  3. Step 3: Cross multiply
    20,789.24x = 28,679.16 × 15,115.20
  4. Step 4: Simplify right side
    20,789.24x = 433,491,239.23
  5. Step 5: Solve for x
    x = 433,491,239.23/20,789.24
  6. Step 6: Final answer
    x = 20,851.71

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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.