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Finding the Fourth Proportional to 627.19, 865.39 and 378.51

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Solution

The fourth proportional to 627.19, 865.39 and 378.51 is: 522.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.19 : 865.39 = 378.51 : x
  2. Step 2: Convert to fraction form
    627.19/865.39 = 378.51/x
  3. Step 3: Cross multiply
    627.19x = 865.39 × 378.51
  4. Step 4: Simplify right side
    627.19x = 327,554.58
  5. Step 5: Solve for x
    x = 327,554.58/627.19
  6. Step 6: Final answer
    x = 522.26

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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.