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Finding the Fourth Proportional to 831.48, 1,247.28 and 254.28

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Solution

The fourth proportional to 831.48, 1,247.28 and 254.28 is: 381.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.48 : 1,247.28 = 254.28 : x
  2. Step 2: Convert to fraction form
    831.48/1,247.28 = 254.28/x
  3. Step 3: Cross multiply
    831.48x = 1,247.28 × 254.28
  4. Step 4: Simplify right side
    831.48x = 317,158.36
  5. Step 5: Solve for x
    x = 317,158.36/831.48
  6. Step 6: Final answer
    x = 381.44

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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.