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Finding the Fourth Proportional to 239.88, 331.02 and 156.96

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Solution

The fourth proportional to 239.88, 331.02 and 156.96 is: 216.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.88 : 331.02 = 156.96 : x
  2. Step 2: Convert to fraction form
    239.88/331.02 = 156.96/x
  3. Step 3: Cross multiply
    239.88x = 331.02 × 156.96
  4. Step 4: Simplify right side
    239.88x = 51,956.90
  5. Step 5: Solve for x
    x = 51,956.90/239.88
  6. Step 6: Final answer
    x = 216.60

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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.