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Finding the Fourth Proportional to 627.25, 865.71 and 378.61

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Solution

The fourth proportional to 627.25, 865.71 and 378.61 is: 522.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.25 : 865.71 = 378.61 : x
  2. Step 2: Convert to fraction form
    627.25/865.71 = 378.61/x
  3. Step 3: Cross multiply
    627.25x = 865.71 × 378.61
  4. Step 4: Simplify right side
    627.25x = 327,762.13
  5. Step 5: Solve for x
    x = 327,762.13/627.25
  6. Step 6: Final answer
    x = 522.54

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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.