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Finding the Fourth Proportional to 2,680.66, 4,021.62 and 831.68

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Solution

The fourth proportional to 2,680.66, 4,021.62 and 831.68 is: 1,247.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,680.66 : 4,021.62 = 831.68 : x
  2. Step 2: Convert to fraction form
    2,680.66/4,021.62 = 831.68/x
  3. Step 3: Cross multiply
    2,680.66x = 4,021.62 × 831.68
  4. Step 4: Simplify right side
    2,680.66x = 3,344,700.92
  5. Step 5: Solve for x
    x = 3,344,700.92/2,680.66
  6. Step 6: Final answer
    x = 1,247.72

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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.