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Finding the Fourth Proportional to 831.42, 1,247.31 and 254.25

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Solution

The fourth proportional to 831.42, 1,247.31 and 254.25 is: 381.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.42 : 1,247.31 = 254.25 : x
  2. Step 2: Convert to fraction form
    831.42/1,247.31 = 254.25/x
  3. Step 3: Cross multiply
    831.42x = 1,247.31 × 254.25
  4. Step 4: Simplify right side
    831.42x = 317,128.57
  5. Step 5: Solve for x
    x = 317,128.57/831.42
  6. Step 6: Final answer
    x = 381.43

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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.