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Finding the Fourth Proportional to 644.34, 965.79 and 279.44

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Solution

The fourth proportional to 644.34, 965.79 and 279.44 is: 418.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.34 : 965.79 = 279.44 : x
  2. Step 2: Convert to fraction form
    644.34/965.79 = 279.44/x
  3. Step 3: Cross multiply
    644.34x = 965.79 × 279.44
  4. Step 4: Simplify right side
    644.34x = 269,875.53
  5. Step 5: Solve for x
    x = 269,875.53/644.34
  6. Step 6: Final answer
    x = 418.84

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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.