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Finding the Fourth Proportional to 831.34, 1,247.00 and 318.34

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Solution

The fourth proportional to 831.34, 1,247.00 and 318.34 is: 477.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.34 : 1,247.00 = 318.34 : x
  2. Step 2: Convert to fraction form
    831.34/1,247.00 = 318.34/x
  3. Step 3: Cross multiply
    831.34x = 1,247.00 × 318.34
  4. Step 4: Simplify right side
    831.34x = 396,963.23
  5. Step 5: Solve for x
    x = 396,963.23/831.34
  6. Step 6: Final answer
    x = 477.50

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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.