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Finding the Fourth Proportional to 831.28, 1,246.92 and 724.36

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Solution

The fourth proportional to 831.28, 1,246.92 and 724.36 is: 1,086.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.28 : 1,246.92 = 724.36 : x
  2. Step 2: Convert to fraction form
    831.28/1,246.92 = 724.36/x
  3. Step 3: Cross multiply
    831.28x = 1,246.92 × 724.36
  4. Step 4: Simplify right side
    831.28x = 903,218.97
  5. Step 5: Solve for x
    x = 903,218.97/831.28
  6. Step 6: Final answer
    x = 1,086.54

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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.