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Finding the Fourth Proportional to 627.44, 865.80 and 378.74

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Solution

The fourth proportional to 627.44, 865.80 and 378.74 is: 522.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.44 : 865.80 = 378.74 : x
  2. Step 2: Convert to fraction form
    627.44/865.80 = 378.74/x
  3. Step 3: Cross multiply
    627.44x = 865.80 × 378.74
  4. Step 4: Simplify right side
    627.44x = 327,913.09
  5. Step 5: Solve for x
    x = 327,913.09/627.44
  6. Step 6: Final answer
    x = 522.62

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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.