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Finding the Fourth Proportional to 831.25, 1,247.42 and 318.25

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Solution

The fourth proportional to 831.25, 1,247.42 and 318.25 is: 477.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.25 : 1,247.42 = 318.25 : x
  2. Step 2: Convert to fraction form
    831.25/1,247.42 = 318.25/x
  3. Step 3: Cross multiply
    831.25x = 1,247.42 × 318.25
  4. Step 4: Simplify right side
    831.25x = 396,991.42
  5. Step 5: Solve for x
    x = 396,991.42/831.25
  6. Step 6: Final answer
    x = 477.58

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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.