Home / 20,351.32-28,081.55-11,399.20

Finding the Fourth Proportional to 20,351.32, 28,081.55 and 11,399.20

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Solution

The fourth proportional to 20,351.32, 28,081.55 and 11,399.20 is: 15,729.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,351.32 : 28,081.55 = 11,399.20 : x
  2. Step 2: Convert to fraction form
    20,351.32/28,081.55 = 11,399.20/x
  3. Step 3: Cross multiply
    20,351.32x = 28,081.55 × 11,399.20
  4. Step 4: Simplify right side
    20,351.32x = 320,107,163.05
  5. Step 5: Solve for x
    x = 320,107,163.05/20,351.32
  6. Step 6: Final answer
    x = 15,729.06

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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.