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Finding the Fourth Proportional to 644.81, 967.44 and 279.55

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Solution

The fourth proportional to 644.81, 967.44 and 279.55 is: 419.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 967.44 = 279.55 : x
  2. Step 2: Convert to fraction form
    644.81/967.44 = 279.55/x
  3. Step 3: Cross multiply
    644.81x = 967.44 × 279.55
  4. Step 4: Simplify right side
    644.81x = 270,441.62
  5. Step 5: Solve for x
    x = 270,441.62/644.81
  6. Step 6: Final answer
    x = 419.42

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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.