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Finding the Fourth Proportional to 627.28, 865.62 and 394.56

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Solution

The fourth proportional to 627.28, 865.62 and 394.56 is: 544.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.28 : 865.62 = 394.56 : x
  2. Step 2: Convert to fraction form
    627.28/865.62 = 394.56/x
  3. Step 3: Cross multiply
    627.28x = 865.62 × 394.56
  4. Step 4: Simplify right side
    627.28x = 341,539.03
  5. Step 5: Solve for x
    x = 341,539.03/627.28
  6. Step 6: Final answer
    x = 544.48

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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.