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Finding the Fourth Proportional to 644.21, 965.29 and 627.13

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Solution

The fourth proportional to 644.21, 965.29 and 627.13 is: 939.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.21 : 965.29 = 627.13 : x
  2. Step 2: Convert to fraction form
    644.21/965.29 = 627.13/x
  3. Step 3: Cross multiply
    644.21x = 965.29 × 627.13
  4. Step 4: Simplify right side
    644.21x = 605,358.34
  5. Step 5: Solve for x
    x = 605,358.34/644.21
  6. Step 6: Final answer
    x = 939.69

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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.