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Finding the Fourth Proportional to 644.78, 967.30 and 211.88

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Solution

The fourth proportional to 644.78, 967.30 and 211.88 is: 317.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.78 : 967.30 = 211.88 : x
  2. Step 2: Convert to fraction form
    644.78/967.30 = 211.88/x
  3. Step 3: Cross multiply
    644.78x = 967.30 × 211.88
  4. Step 4: Simplify right side
    644.78x = 204,946.16
  5. Step 5: Solve for x
    x = 204,946.16/644.78
  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.