Home / 2,680.60-4,020.90-831.56

Finding the Fourth Proportional to 2,680.60, 4,020.90 and 831.56

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Solution

The fourth proportional to 2,680.60, 4,020.90 and 831.56 is: 1,247.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,680.60 : 4,020.90 = 831.56 : x
  2. Step 2: Convert to fraction form
    2,680.60/4,020.90 = 831.56/x
  3. Step 3: Cross multiply
    2,680.60x = 4,020.90 × 831.56
  4. Step 4: Simplify right side
    2,680.60x = 3,343,619.60
  5. Step 5: Solve for x
    x = 3,343,619.60/2,680.60
  6. Step 6: Final answer
    x = 1,247.34

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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.