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Finding the Fourth Proportional to 644.62, 966.72 and 259.78

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Solution

The fourth proportional to 644.62, 966.72 and 259.78 is: 389.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.62 : 966.72 = 259.78 : x
  2. Step 2: Convert to fraction form
    644.62/966.72 = 259.78/x
  3. Step 3: Cross multiply
    644.62x = 966.72 × 259.78
  4. Step 4: Simplify right side
    644.62x = 251,134.52
  5. Step 5: Solve for x
    x = 251,134.52/644.62
  6. Step 6: Final answer
    x = 389.59

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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.