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Finding the Fourth Proportional to 644.11, 966.17 and 211.27

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Solution

The fourth proportional to 644.11, 966.17 and 211.27 is: 316.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.11 : 966.17 = 211.27 : x
  2. Step 2: Convert to fraction form
    644.11/966.17 = 211.27/x
  3. Step 3: Cross multiply
    644.11x = 966.17 × 211.27
  4. Step 4: Simplify right side
    644.11x = 204,120.85
  5. Step 5: Solve for x
    x = 204,120.85/644.11
  6. Step 6: Final answer
    x = 316.90

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Double scale
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Similar ratio
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1.5x scale

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.