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Finding the Fourth Proportional to 627.68, 865.84 and 391.52

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Solution

The fourth proportional to 627.68, 865.84 and 391.52 is: 540.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.68 : 865.84 = 391.52 : x
  2. Step 2: Convert to fraction form
    627.68/865.84 = 391.52/x
  3. Step 3: Cross multiply
    627.68x = 865.84 × 391.52
  4. Step 4: Simplify right side
    627.68x = 338,993.68
  5. Step 5: Solve for x
    x = 338,993.68/627.68
  6. Step 6: Final answer
    x = 540.07

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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.