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Finding the Fourth Proportional to 518.85, 716.97 and 394.31

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Solution

The fourth proportional to 518.85, 716.97 and 394.31 is: 544.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.85 : 716.97 = 394.31 : x
  2. Step 2: Convert to fraction form
    518.85/716.97 = 394.31/x
  3. Step 3: Cross multiply
    518.85x = 716.97 × 394.31
  4. Step 4: Simplify right side
    518.85x = 282,704.86
  5. Step 5: Solve for x
    x = 282,704.86/518.85
  6. Step 6: Final answer
    x = 544.87

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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.