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Finding the Fourth Proportional to 220.94, 331.42 and 159.78

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Solution

The fourth proportional to 220.94, 331.42 and 159.78 is: 239.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.94 : 331.42 = 159.78 : x
  2. Step 2: Convert to fraction form
    220.94/331.42 = 159.78/x
  3. Step 3: Cross multiply
    220.94x = 331.42 × 159.78
  4. Step 4: Simplify right side
    220.94x = 52,954.29
  5. Step 5: Solve for x
    x = 52,954.29/220.94
  6. Step 6: Final answer
    x = 239.68

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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.