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Finding the Fourth Proportional to 627.06, 865.53 and 378.39

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Solution

The fourth proportional to 627.06, 865.53 and 378.39 is: 522.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.06 : 865.53 = 378.39 : x
  2. Step 2: Convert to fraction form
    627.06/865.53 = 378.39/x
  3. Step 3: Cross multiply
    627.06x = 865.53 × 378.39
  4. Step 4: Simplify right side
    627.06x = 327,507.90
  5. Step 5: Solve for x
    x = 327,507.90/627.06
  6. Step 6: Final answer
    x = 522.29

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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.