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Finding the Fourth Proportional to 831.28, 1,246.84 and 254.56

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Solution

The fourth proportional to 831.28, 1,246.84 and 254.56 is: 381.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.28 : 1,246.84 = 254.56 : x
  2. Step 2: Convert to fraction form
    831.28/1,246.84 = 254.56/x
  3. Step 3: Cross multiply
    831.28x = 1,246.84 × 254.56
  4. Step 4: Simplify right side
    831.28x = 317,395.59
  5. Step 5: Solve for x
    x = 317,395.59/831.28
  6. Step 6: Final answer
    x = 381.82

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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.