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Finding the Fourth Proportional to 231.12, 319.02 and 161.28

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Solution

The fourth proportional to 231.12, 319.02 and 161.28 is: 222.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.12 : 319.02 = 161.28 : x
  2. Step 2: Convert to fraction form
    231.12/319.02 = 161.28/x
  3. Step 3: Cross multiply
    231.12x = 319.02 × 161.28
  4. Step 4: Simplify right side
    231.12x = 51,451.55
  5. Step 5: Solve for x
    x = 51,451.55/231.12
  6. Step 6: Final answer
    x = 222.62

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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.