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Finding the Fourth Proportional to 627.58, 865.72 and 378.78

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Solution

The fourth proportional to 627.58, 865.72 and 378.78 is: 522.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.58 : 865.72 = 378.78 : x
  2. Step 2: Convert to fraction form
    627.58/865.72 = 378.78/x
  3. Step 3: Cross multiply
    627.58x = 865.72 × 378.78
  4. Step 4: Simplify right side
    627.58x = 327,917.42
  5. Step 5: Solve for x
    x = 327,917.42/627.58
  6. Step 6: Final answer
    x = 522.51

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Double scale
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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.