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Finding the Fourth Proportional to 231.72, 319.66 and 138.44

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Solution

The fourth proportional to 231.72, 319.66 and 138.44 is: 190.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.72 : 319.66 = 138.44 : x
  2. Step 2: Convert to fraction form
    231.72/319.66 = 138.44/x
  3. Step 3: Cross multiply
    231.72x = 319.66 × 138.44
  4. Step 4: Simplify right side
    231.72x = 44,253.73
  5. Step 5: Solve for x
    x = 44,253.73/231.72
  6. Step 6: Final answer
    x = 190.98

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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.