Home / 20,831.25-28,747.13-11,399.81

Finding the Fourth Proportional to 20,831.25, 28,747.13 and 11,399.81

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Solution

The fourth proportional to 20,831.25, 28,747.13 and 11,399.81 is: 15,731.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.25 : 28,747.13 = 11,399.81 : x
  2. Step 2: Convert to fraction form
    20,831.25/28,747.13 = 11,399.81/x
  3. Step 3: Cross multiply
    20,831.25x = 28,747.13 × 11,399.81
  4. Step 4: Simplify right side
    20,831.25x = 327,711,820.05
  5. Step 5: Solve for x
    x = 327,711,820.05/20,831.25
  6. Step 6: Final answer
    x = 15,731.74

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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.