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Finding the Fourth Proportional to 644.71, 966.42 and 315.43

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Solution

The fourth proportional to 644.71, 966.42 and 315.43 is: 472.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.71 : 966.42 = 315.43 : x
  2. Step 2: Convert to fraction form
    644.71/966.42 = 315.43/x
  3. Step 3: Cross multiply
    644.71x = 966.42 × 315.43
  4. Step 4: Simplify right side
    644.71x = 304,837.86
  5. Step 5: Solve for x
    x = 304,837.86/644.71
  6. Step 6: Final answer
    x = 472.83

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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.