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Finding the Fourth Proportional to 627.21, 865.49 and 394.47

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Solution

The fourth proportional to 627.21, 865.49 and 394.47 is: 544.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.21 : 865.49 = 394.47 : x
  2. Step 2: Convert to fraction form
    627.21/865.49 = 394.47/x
  3. Step 3: Cross multiply
    627.21x = 865.49 × 394.47
  4. Step 4: Simplify right side
    627.21x = 341,407.87
  5. Step 5: Solve for x
    x = 341,407.87/627.21
  6. Step 6: Final answer
    x = 544.33

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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.