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Finding the Fourth Proportional to 644.06, 966.11 and 278.84

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Solution

The fourth proportional to 644.06, 966.11 and 278.84 is: 418.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.06 : 966.11 = 278.84 : x
  2. Step 2: Convert to fraction form
    644.06/966.11 = 278.84/x
  3. Step 3: Cross multiply
    644.06x = 966.11 × 278.84
  4. Step 4: Simplify right side
    644.06x = 269,393.88
  5. Step 5: Solve for x
    x = 269,393.88/644.06
  6. Step 6: Final answer
    x = 418.27

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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.