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Finding the Fourth Proportional to 644.51, 966.86 and 211.56

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Solution

The fourth proportional to 644.51, 966.86 and 211.56 is: 317.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.51 : 966.86 = 211.56 : x
  2. Step 2: Convert to fraction form
    644.51/966.86 = 211.56/x
  3. Step 3: Cross multiply
    644.51x = 966.86 × 211.56
  4. Step 4: Simplify right side
    644.51x = 204,548.90
  5. Step 5: Solve for x
    x = 204,548.90/644.51
  6. Step 6: Final answer
    x = 317.37

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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.