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Finding the Fourth Proportional to 627.03, 865.14 and 390.61

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Solution

The fourth proportional to 627.03, 865.14 and 390.61 is: 538.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.03 : 865.14 = 390.61 : x
  2. Step 2: Convert to fraction form
    627.03/865.14 = 390.61/x
  3. Step 3: Cross multiply
    627.03x = 865.14 × 390.61
  4. Step 4: Simplify right side
    627.03x = 337,932.34
  5. Step 5: Solve for x
    x = 337,932.34/627.03
  6. Step 6: Final answer
    x = 538.94

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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.