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Finding the Fourth Proportional to 240.45, 331.92 and 142.21

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Solution

The fourth proportional to 240.45, 331.92 and 142.21 is: 196.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.45 : 331.92 = 142.21 : x
  2. Step 2: Convert to fraction form
    240.45/331.92 = 142.21/x
  3. Step 3: Cross multiply
    240.45x = 331.92 × 142.21
  4. Step 4: Simplify right side
    240.45x = 47,200.89
  5. Step 5: Solve for x
    x = 47,200.89/240.45
  6. Step 6: Final answer
    x = 196.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.