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Finding the Fourth Proportional to 627.48, 865.36 and 378.71

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Solution

The fourth proportional to 627.48, 865.36 and 378.71 is: 522.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.48 : 865.36 = 378.71 : x
  2. Step 2: Convert to fraction form
    627.48/865.36 = 378.71/x
  3. Step 3: Cross multiply
    627.48x = 865.36 × 378.71
  4. Step 4: Simplify right side
    627.48x = 327,720.49
  5. Step 5: Solve for x
    x = 327,720.49/627.48
  6. Step 6: Final answer
    x = 522.28

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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.