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Finding the Fourth Proportional to 644.82, 967.32 and 211.89

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Solution

The fourth proportional to 644.82, 967.32 and 211.89 is: 317.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.82 : 967.32 = 211.89 : x
  2. Step 2: Convert to fraction form
    644.82/967.32 = 211.89/x
  3. Step 3: Cross multiply
    644.82x = 967.32 × 211.89
  4. Step 4: Simplify right side
    644.82x = 204,965.43
  5. Step 5: Solve for x
    x = 204,965.43/644.82
  6. Step 6: Final answer
    x = 317.86

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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.