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Finding the Fourth Proportional to 643.98, 966 and 211.14

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Solution

The fourth proportional to 643.98, 966 and 211.14 is: 316.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.98 : 966 = 211.14 : x
  2. Step 2: Convert to fraction form
    643.98/966 = 211.14/x
  3. Step 3: Cross multiply
    643.98x = 966 × 211.14
  4. Step 4: Simplify right side
    643.98x = 203,961.24
  5. Step 5: Solve for x
    x = 203,961.24/643.98
  6. Step 6: Final answer
    x = 316.72

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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.