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Finding the Fourth Proportional to 239.90, 331.20 and 156.97

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Solution

The fourth proportional to 239.90, 331.20 and 156.97 is: 216.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.90 : 331.20 = 156.97 : x
  2. Step 2: Convert to fraction form
    239.90/331.20 = 156.97/x
  3. Step 3: Cross multiply
    239.90x = 331.20 × 156.97
  4. Step 4: Simplify right side
    239.90x = 51,988.46
  5. Step 5: Solve for x
    x = 51,988.46/239.90
  6. Step 6: Final answer
    x = 216.71

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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.