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Finding the Fourth Proportional to 644.28, 966.37 and 315.09

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Solution

The fourth proportional to 644.28, 966.37 and 315.09 is: 472.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.28 : 966.37 = 315.09 : x
  2. Step 2: Convert to fraction form
    644.28/966.37 = 315.09/x
  3. Step 3: Cross multiply
    644.28x = 966.37 × 315.09
  4. Step 4: Simplify right side
    644.28x = 304,487.12
  5. Step 5: Solve for x
    x = 304,487.12/644.28
  6. Step 6: Final answer
    x = 472.60

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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.