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Finding the Fourth Proportional to 239.94, 331.12 and 141.78

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Solution

The fourth proportional to 239.94, 331.12 and 141.78 is: 195.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.94 : 331.12 = 141.78 : x
  2. Step 2: Convert to fraction form
    239.94/331.12 = 141.78/x
  3. Step 3: Cross multiply
    239.94x = 331.12 × 141.78
  4. Step 4: Simplify right side
    239.94x = 46,946.19
  5. Step 5: Solve for x
    x = 46,946.19/239.94
  6. Step 6: Final answer
    x = 195.66

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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.