Home / 2,680.38-4,020.84-831.42

Finding the Fourth Proportional to 2,680.38, 4,020.84 and 831.42

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Solution

The fourth proportional to 2,680.38, 4,020.84 and 831.42 is: 1,247.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,680.38 : 4,020.84 = 831.42 : x
  2. Step 2: Convert to fraction form
    2,680.38/4,020.84 = 831.42/x
  3. Step 3: Cross multiply
    2,680.38x = 4,020.84 × 831.42
  4. Step 4: Simplify right side
    2,680.38x = 3,343,006.79
  5. Step 5: Solve for x
    x = 3,343,006.79/2,680.38
  6. Step 6: Final answer
    x = 1,247.21

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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.