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Finding the Fourth Proportional to 644.90, 966.54 and 279.29

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Solution

The fourth proportional to 644.90, 966.54 and 279.29 is: 418.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.90 : 966.54 = 279.29 : x
  2. Step 2: Convert to fraction form
    644.90/966.54 = 279.29/x
  3. Step 3: Cross multiply
    644.90x = 966.54 × 279.29
  4. Step 4: Simplify right side
    644.90x = 269,947.37
  5. Step 5: Solve for x
    x = 269,947.37/644.90
  6. Step 6: Final answer
    x = 418.59

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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.