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Finding the Fourth Proportional to 831.20, 1,243.90 and 683.17

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Solution

The fourth proportional to 831.20, 1,243.90 and 683.17 is: 1,022.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,243.90 = 683.17 : x
  2. Step 2: Convert to fraction form
    831.20/1,243.90 = 683.17/x
  3. Step 3: Cross multiply
    831.20x = 1,243.90 × 683.17
  4. Step 4: Simplify right side
    831.20x = 849,795.16
  5. Step 5: Solve for x
    x = 849,795.16/831.20
  6. Step 6: Final answer
    x = 1,022.37

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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.