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Finding the Fourth Proportional to 831.20, 1,246.74 and 310.97

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Solution

The fourth proportional to 831.20, 1,246.74 and 310.97 is: 466.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,246.74 = 310.97 : x
  2. Step 2: Convert to fraction form
    831.20/1,246.74 = 310.97/x
  3. Step 3: Cross multiply
    831.20x = 1,246.74 × 310.97
  4. Step 4: Simplify right side
    831.20x = 387,698.74
  5. Step 5: Solve for x
    x = 387,698.74/831.20
  6. Step 6: Final answer
    x = 466.43

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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.