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Finding the Fourth Proportional to 644.61, 966.41 and 279.15

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Solution

The fourth proportional to 644.61, 966.41 and 279.15 is: 418.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.61 : 966.41 = 279.15 : x
  2. Step 2: Convert to fraction form
    644.61/966.41 = 279.15/x
  3. Step 3: Cross multiply
    644.61x = 966.41 × 279.15
  4. Step 4: Simplify right side
    644.61x = 269,771.96
  5. Step 5: Solve for x
    x = 269,771.96/644.61
  6. Step 6: Final answer
    x = 418.50

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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.