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Finding the Fourth Proportional to 231.32, 318.89 and 161.36

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Solution

The fourth proportional to 231.32, 318.89 and 161.36 is: 222.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.32 : 318.89 = 161.36 : x
  2. Step 2: Convert to fraction form
    231.32/318.89 = 161.36/x
  3. Step 3: Cross multiply
    231.32x = 318.89 × 161.36
  4. Step 4: Simplify right side
    231.32x = 51,453.69
  5. Step 5: Solve for x
    x = 51,453.69/231.32
  6. Step 6: Final answer
    x = 222.44

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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.