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Finding the Fourth Proportional to 644.50, 966.92 and 211.66

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Solution

The fourth proportional to 644.50, 966.92 and 211.66 is: 317.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 966.92 = 211.66 : x
  2. Step 2: Convert to fraction form
    644.50/966.92 = 211.66/x
  3. Step 3: Cross multiply
    644.50x = 966.92 × 211.66
  4. Step 4: Simplify right side
    644.50x = 204,657.23
  5. Step 5: Solve for x
    x = 204,657.23/644.50
  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.