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Finding the Fourth Proportional to 627.61, 939.44 and 431.46

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Solution

The fourth proportional to 627.61, 939.44 and 431.46 is: 645.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.61 : 939.44 = 431.46 : x
  2. Step 2: Convert to fraction form
    627.61/939.44 = 431.46/x
  3. Step 3: Cross multiply
    627.61x = 939.44 × 431.46
  4. Step 4: Simplify right side
    627.61x = 405,330.78
  5. Step 5: Solve for x
    x = 405,330.78/627.61
  6. Step 6: Final answer
    x = 645.83

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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.