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Finding the Fourth Proportional to 391.27, 540.68 and 317.97

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Solution

The fourth proportional to 391.27, 540.68 and 317.97 is: 439.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.27 : 540.68 = 317.97 : x
  2. Step 2: Convert to fraction form
    391.27/540.68 = 317.97/x
  3. Step 3: Cross multiply
    391.27x = 540.68 × 317.97
  4. Step 4: Simplify right side
    391.27x = 171,920.02
  5. Step 5: Solve for x
    x = 171,920.02/391.27
  6. Step 6: Final answer
    x = 439.39

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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.