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Finding the Fourth Proportional to 644.57, 966.78 and 211.71

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Solution

The fourth proportional to 644.57, 966.78 and 211.71 is: 317.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.57 : 966.78 = 211.71 : x
  2. Step 2: Convert to fraction form
    644.57/966.78 = 211.71/x
  3. Step 3: Cross multiply
    644.57x = 966.78 × 211.71
  4. Step 4: Simplify right side
    644.57x = 204,676.99
  5. Step 5: Solve for x
    x = 204,676.99/644.57
  6. Step 6: Final answer
    x = 317.54

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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.