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Finding the Fourth Proportional to 158.96, 238.39 and 81.90

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Solution

The fourth proportional to 158.96, 238.39 and 81.90 is: 122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.96 : 238.39 = 81.90 : x
  2. Step 2: Convert to fraction form
    158.96/238.39 = 81.90/x
  3. Step 3: Cross multiply
    158.96x = 238.39 × 81.90
  4. Step 4: Simplify right side
    158.96x = 19,523.94
  5. Step 5: Solve for x
    x = 19,523.94/158.96
  6. Step 6: Final answer
    x = 122.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.