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Finding the Fourth Proportional to 239.90, 330.96 and 140.30

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Solution

The fourth proportional to 239.90, 330.96 and 140.30 is: 193.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.90 : 330.96 = 140.30 : x
  2. Step 2: Convert to fraction form
    239.90/330.96 = 140.30/x
  3. Step 3: Cross multiply
    239.90x = 330.96 × 140.30
  4. Step 4: Simplify right side
    239.90x = 46,433.69
  5. Step 5: Solve for x
    x = 46,433.69/239.90
  6. Step 6: Final answer
    x = 193.55

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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.