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Finding the Fourth Proportional to 644.40, 965.57 and 627.31

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Solution

The fourth proportional to 644.40, 965.57 and 627.31 is: 939.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.40 : 965.57 = 627.31 : x
  2. Step 2: Convert to fraction form
    644.40/965.57 = 627.31/x
  3. Step 3: Cross multiply
    644.40x = 965.57 × 627.31
  4. Step 4: Simplify right side
    644.40x = 605,709.79
  5. Step 5: Solve for x
    x = 605,709.79/644.40
  6. Step 6: Final answer
    x = 939.96

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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.