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Finding the Fourth Proportional to 239.77, 330.88 and 140.20

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Solution

The fourth proportional to 239.77, 330.88 and 140.20 is: 193.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.77 : 330.88 = 140.20 : x
  2. Step 2: Convert to fraction form
    239.77/330.88 = 140.20/x
  3. Step 3: Cross multiply
    239.77x = 330.88 × 140.20
  4. Step 4: Simplify right side
    239.77x = 46,388.68
  5. Step 5: Solve for x
    x = 46,388.68/239.77
  6. Step 6: Final answer
    x = 193.48

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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.