Home / 20,831.32-28,747.21-11,399.88

Finding the Fourth Proportional to 20,831.32, 28,747.21 and 11,399.88

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Solution

The fourth proportional to 20,831.32, 28,747.21 and 11,399.88 is: 15,731.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.32 : 28,747.21 = 11,399.88 : x
  2. Step 2: Convert to fraction form
    20,831.32/28,747.21 = 11,399.88/x
  3. Step 3: Cross multiply
    20,831.32x = 28,747.21 × 11,399.88
  4. Step 4: Simplify right side
    20,831.32x = 327,714,744.33
  5. Step 5: Solve for x
    x = 327,714,744.33/20,831.32
  6. Step 6: Final answer
    x = 15,731.83

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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.