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Finding the Fourth Proportional to 391.29, 539.47 and 324.66

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Solution

The fourth proportional to 391.29, 539.47 and 324.66 is: 447.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.29 : 539.47 = 324.66 : x
  2. Step 2: Convert to fraction form
    391.29/539.47 = 324.66/x
  3. Step 3: Cross multiply
    391.29x = 539.47 × 324.66
  4. Step 4: Simplify right side
    391.29x = 175,144.33
  5. Step 5: Solve for x
    x = 175,144.33/391.29
  6. Step 6: Final answer
    x = 447.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.