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Finding the Fourth Proportional to 627.05, 865.46 and 390.95

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Solution

The fourth proportional to 627.05, 865.46 and 390.95 is: 539.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.05 : 865.46 = 390.95 : x
  2. Step 2: Convert to fraction form
    627.05/865.46 = 390.95/x
  3. Step 3: Cross multiply
    627.05x = 865.46 × 390.95
  4. Step 4: Simplify right side
    627.05x = 338,350.59
  5. Step 5: Solve for x
    x = 338,350.59/627.05
  6. Step 6: Final answer
    x = 539.60

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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.