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Finding the Fourth Proportional to 239.99, 331.19 and 140.47

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Solution

The fourth proportional to 239.99, 331.19 and 140.47 is: 193.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.99 : 331.19 = 140.47 : x
  2. Step 2: Convert to fraction form
    239.99/331.19 = 140.47/x
  3. Step 3: Cross multiply
    239.99x = 331.19 × 140.47
  4. Step 4: Simplify right side
    239.99x = 46,522.67
  5. Step 5: Solve for x
    x = 46,522.67/239.99
  6. Step 6: Final answer
    x = 193.85

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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.