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Finding the Fourth Proportional to 644.54, 966.29 and 319.73

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Solution

The fourth proportional to 644.54, 966.29 and 319.73 is: 479.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.54 : 966.29 = 319.73 : x
  2. Step 2: Convert to fraction form
    644.54/966.29 = 319.73/x
  3. Step 3: Cross multiply
    644.54x = 966.29 × 319.73
  4. Step 4: Simplify right side
    644.54x = 308,950.30
  5. Step 5: Solve for x
    x = 308,950.30/644.54
  6. Step 6: Final answer
    x = 479.33

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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.