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Finding the Fourth Proportional to 644.29, 966.44 and 387.25

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Solution

The fourth proportional to 644.29, 966.44 and 387.25 is: 580.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.29 : 966.44 = 387.25 : x
  2. Step 2: Convert to fraction form
    644.29/966.44 = 387.25/x
  3. Step 3: Cross multiply
    644.29x = 966.44 × 387.25
  4. Step 4: Simplify right side
    644.29x = 374,253.89
  5. Step 5: Solve for x
    x = 374,253.89/644.29
  6. Step 6: Final answer
    x = 580.88

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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.