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Finding the Fourth Proportional to 644.48, 966.87 and 211.64

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Solution

The fourth proportional to 644.48, 966.87 and 211.64 is: 317.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.48 : 966.87 = 211.64 : x
  2. Step 2: Convert to fraction form
    644.48/966.87 = 211.64/x
  3. Step 3: Cross multiply
    644.48x = 966.87 × 211.64
  4. Step 4: Simplify right side
    644.48x = 204,628.37
  5. Step 5: Solve for x
    x = 204,628.37/644.48
  6. Step 6: Final answer
    x = 317.51

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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.