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Finding the Fourth Proportional to 627.38, 940.44 and 421.47

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Solution

The fourth proportional to 627.38, 940.44 and 421.47 is: 631.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.38 : 940.44 = 421.47 : x
  2. Step 2: Convert to fraction form
    627.38/940.44 = 421.47/x
  3. Step 3: Cross multiply
    627.38x = 940.44 × 421.47
  4. Step 4: Simplify right side
    627.38x = 396,367.25
  5. Step 5: Solve for x
    x = 396,367.25/627.38
  6. Step 6: Final answer
    x = 631.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.