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Finding the Fourth Proportional to 627.28, 865.68 and 378.58

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Solution

The fourth proportional to 627.28, 865.68 and 378.58 is: 522.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.28 : 865.68 = 378.58 : x
  2. Step 2: Convert to fraction form
    627.28/865.68 = 378.58/x
  3. Step 3: Cross multiply
    627.28x = 865.68 × 378.58
  4. Step 4: Simplify right side
    627.28x = 327,729.13
  5. Step 5: Solve for x
    x = 327,729.13/627.28
  6. Step 6: Final answer
    x = 522.46

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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.