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Finding the Fourth Proportional to 831.97, 1,247.59 and 254.71

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Solution

The fourth proportional to 831.97, 1,247.59 and 254.71 is: 381.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.97 : 1,247.59 = 254.71 : x
  2. Step 2: Convert to fraction form
    831.97/1,247.59 = 254.71/x
  3. Step 3: Cross multiply
    831.97x = 1,247.59 × 254.71
  4. Step 4: Simplify right side
    831.97x = 317,773.65
  5. Step 5: Solve for x
    x = 317,773.65/831.97
  6. Step 6: Final answer
    x = 381.95

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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.