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Finding the Fourth Proportional to 627.33, 865.38 and 378.75

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Solution

The fourth proportional to 627.33, 865.38 and 378.75 is: 522.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.33 : 865.38 = 378.75 : x
  2. Step 2: Convert to fraction form
    627.33/865.38 = 378.75/x
  3. Step 3: Cross multiply
    627.33x = 865.38 × 378.75
  4. Step 4: Simplify right side
    627.33x = 327,762.68
  5. Step 5: Solve for x
    x = 327,762.68/627.33
  6. Step 6: Final answer
    x = 522.47

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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.