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Finding the Fourth Proportional to 240.42, 331.79 and 142.21

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Solution

The fourth proportional to 240.42, 331.79 and 142.21 is: 196.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.42 : 331.79 = 142.21 : x
  2. Step 2: Convert to fraction form
    240.42/331.79 = 142.21/x
  3. Step 3: Cross multiply
    240.42x = 331.79 × 142.21
  4. Step 4: Simplify right side
    240.42x = 47,183.86
  5. Step 5: Solve for x
    x = 47,183.86/240.42
  6. Step 6: Final answer
    x = 196.26

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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.