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Finding the Fourth Proportional to 644.30, 966.60 and 211.46

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Solution

The fourth proportional to 644.30, 966.60 and 211.46 is: 317.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.30 : 966.60 = 211.46 : x
  2. Step 2: Convert to fraction form
    644.30/966.60 = 211.46/x
  3. Step 3: Cross multiply
    644.30x = 966.60 × 211.46
  4. Step 4: Simplify right side
    644.30x = 204,397.24
  5. Step 5: Solve for x
    x = 204,397.24/644.30
  6. Step 6: Final answer
    x = 317.24

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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.