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Finding the Fourth Proportional to 231.18, 319.26 and 161.41

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Solution

The fourth proportional to 231.18, 319.26 and 161.41 is: 222.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.18 : 319.26 = 161.41 : x
  2. Step 2: Convert to fraction form
    231.18/319.26 = 161.41/x
  3. Step 3: Cross multiply
    231.18x = 319.26 × 161.41
  4. Step 4: Simplify right side
    231.18x = 51,531.76
  5. Step 5: Solve for x
    x = 51,531.76/231.18
  6. Step 6: Final answer
    x = 222.91

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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.