Home / 20,831.36-31,251.84-6,980

Finding the Fourth Proportional to 20,831.36, 31,251.84 and 6,980

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Solution

The fourth proportional to 20,831.36, 31,251.84 and 6,980 is: 10,471.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.36 : 31,251.84 = 6,980 : x
  2. Step 2: Convert to fraction form
    20,831.36/31,251.84 = 6,980/x
  3. Step 3: Cross multiply
    20,831.36x = 31,251.84 × 6,980
  4. Step 4: Simplify right side
    20,831.36x = 218,137,843.20
  5. Step 5: Solve for x
    x = 218,137,843.20/20,831.36
  6. Step 6: Final answer
    x = 10,471.61

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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.