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Finding the Fourth Proportional to 239.90, 330.89 and 161.19

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Solution

The fourth proportional to 239.90, 330.89 and 161.19 is: 222.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.90 : 330.89 = 161.19 : x
  2. Step 2: Convert to fraction form
    239.90/330.89 = 161.19/x
  3. Step 3: Cross multiply
    239.90x = 330.89 × 161.19
  4. Step 4: Simplify right side
    239.90x = 53,335.35
  5. Step 5: Solve for x
    x = 53,335.35/239.90
  6. Step 6: Final answer
    x = 222.33

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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.