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Finding the Fourth Proportional to 239.16, 329.58 and 161.40

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Solution

The fourth proportional to 239.16, 329.58 and 161.40 is: 222.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.16 : 329.58 = 161.40 : x
  2. Step 2: Convert to fraction form
    239.16/329.58 = 161.40/x
  3. Step 3: Cross multiply
    239.16x = 329.58 × 161.40
  4. Step 4: Simplify right side
    239.16x = 53,194.21
  5. Step 5: Solve for x
    x = 53,194.21/239.16
  6. Step 6: Final answer
    x = 222.42

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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.