Home / 20,871.86-31,309.70-6,831.96

Finding the Fourth Proportional to 20,871.86, 31,309.70 and 6,831.96

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Solution

The fourth proportional to 20,871.86, 31,309.70 and 6,831.96 is: 10,248.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.86 : 31,309.70 = 6,831.96 : x
  2. Step 2: Convert to fraction form
    20,871.86/31,309.70 = 6,831.96/x
  3. Step 3: Cross multiply
    20,871.86x = 31,309.70 × 6,831.96
  4. Step 4: Simplify right side
    20,871.86x = 213,906,583.85
  5. Step 5: Solve for x
    x = 213,906,583.85/20,871.86
  6. Step 6: Final answer
    x = 10,248.57

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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.