Home / 20,680.72-28,540.56-11,249.12

Finding the Fourth Proportional to 20,680.72, 28,540.56 and 11,249.12

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Solution

The fourth proportional to 20,680.72, 28,540.56 and 11,249.12 is: 15,524.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.72 : 28,540.56 = 11,249.12 : x
  2. Step 2: Convert to fraction form
    20,680.72/28,540.56 = 11,249.12/x
  3. Step 3: Cross multiply
    20,680.72x = 28,540.56 × 11,249.12
  4. Step 4: Simplify right side
    20,680.72x = 321,056,184.31
  5. Step 5: Solve for x
    x = 321,056,184.31/20,680.72
  6. Step 6: Final answer
    x = 15,524.42

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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.