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Finding the Fourth Proportional to 627.91, 866.42 and 394.87

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Solution

The fourth proportional to 627.91, 866.42 and 394.87 is: 544.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.91 : 866.42 = 394.87 : x
  2. Step 2: Convert to fraction form
    627.91/866.42 = 394.87/x
  3. Step 3: Cross multiply
    627.91x = 866.42 × 394.87
  4. Step 4: Simplify right side
    627.91x = 342,121.29
  5. Step 5: Solve for x
    x = 342,121.29/627.91
  6. Step 6: Final answer
    x = 544.86

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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.