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Finding the Fourth Proportional to 831.23, 1,246.93 and 398.39

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Solution

The fourth proportional to 831.23, 1,246.93 and 398.39 is: 597.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.23 : 1,246.93 = 398.39 : x
  2. Step 2: Convert to fraction form
    831.23/1,246.93 = 398.39/x
  3. Step 3: Cross multiply
    831.23x = 1,246.93 × 398.39
  4. Step 4: Simplify right side
    831.23x = 496,766.56
  5. Step 5: Solve for x
    x = 496,766.56/831.23
  6. Step 6: Final answer
    x = 597.63

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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.