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Finding the Fourth Proportional to 644.78, 967.04 and 211.84

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Solution

The fourth proportional to 644.78, 967.04 and 211.84 is: 317.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.78 : 967.04 = 211.84 : x
  2. Step 2: Convert to fraction form
    644.78/967.04 = 211.84/x
  3. Step 3: Cross multiply
    644.78x = 967.04 × 211.84
  4. Step 4: Simplify right side
    644.78x = 204,857.75
  5. Step 5: Solve for x
    x = 204,857.75/644.78
  6. Step 6: Final answer
    x = 317.72

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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.