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Finding the Fourth Proportional to 831.26, 1,247.64 and 441.54

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Solution

The fourth proportional to 831.26, 1,247.64 and 441.54 is: 662.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.26 : 1,247.64 = 441.54 : x
  2. Step 2: Convert to fraction form
    831.26/1,247.64 = 441.54/x
  3. Step 3: Cross multiply
    831.26x = 1,247.64 × 441.54
  4. Step 4: Simplify right side
    831.26x = 550,882.97
  5. Step 5: Solve for x
    x = 550,882.97/831.26
  6. Step 6: Final answer
    x = 662.71

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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.