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Finding the Fourth Proportional to 627.19, 865.94 and 391.48

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Solution

The fourth proportional to 627.19, 865.94 and 391.48 is: 540.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.19 : 865.94 = 391.48 : x
  2. Step 2: Convert to fraction form
    627.19/865.94 = 391.48/x
  3. Step 3: Cross multiply
    627.19x = 865.94 × 391.48
  4. Step 4: Simplify right side
    627.19x = 338,996.23
  5. Step 5: Solve for x
    x = 338,996.23/627.19
  6. Step 6: Final answer
    x = 540.50

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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.