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Finding the Fourth Proportional to 644.03, 966.11 and 278.85

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Solution

The fourth proportional to 644.03, 966.11 and 278.85 is: 418.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.03 : 966.11 = 278.85 : x
  2. Step 2: Convert to fraction form
    644.03/966.11 = 278.85/x
  3. Step 3: Cross multiply
    644.03x = 966.11 × 278.85
  4. Step 4: Simplify right side
    644.03x = 269,398.38
  5. Step 5: Solve for x
    x = 269,398.38/644.03
  6. Step 6: Final answer
    x = 418.30

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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.