Home / 20,917.20-31,375.80-9,831.54

Finding the Fourth Proportional to 20,917.20, 31,375.80 and 9,831.54

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Solution

The fourth proportional to 20,917.20, 31,375.80 and 9,831.54 is: 14,747.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.20 : 31,375.80 = 9,831.54 : x
  2. Step 2: Convert to fraction form
    20,917.20/31,375.80 = 9,831.54/x
  3. Step 3: Cross multiply
    20,917.20x = 31,375.80 × 9,831.54
  4. Step 4: Simplify right side
    20,917.20x = 308,472,432.73
  5. Step 5: Solve for x
    x = 308,472,432.73/20,917.20
  6. Step 6: Final answer
    x = 14,747.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.