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Finding the Fourth Proportional to 831.28, 1,147.65 and 551.90

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Solution

The fourth proportional to 831.28, 1,147.65 and 551.90 is: 761.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.28 : 1,147.65 = 551.90 : x
  2. Step 2: Convert to fraction form
    831.28/1,147.65 = 551.90/x
  3. Step 3: Cross multiply
    831.28x = 1,147.65 × 551.90
  4. Step 4: Simplify right side
    831.28x = 633,388.04
  5. Step 5: Solve for x
    x = 633,388.04/831.28
  6. Step 6: Final answer
    x = 761.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.