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Finding the Fourth Proportional to 644.25, 966.39 and 279.03

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Solution

The fourth proportional to 644.25, 966.39 and 279.03 is: 418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.25 : 966.39 = 279.03 : x
  2. Step 2: Convert to fraction form
    644.25/966.39 = 279.03/x
  3. Step 3: Cross multiply
    644.25x = 966.39 × 279.03
  4. Step 4: Simplify right side
    644.25x = 269,651.80
  5. Step 5: Solve for x
    x = 269,651.80/644.25
  6. Step 6: Final answer
    x = 418.55

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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.