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Finding the Fourth Proportional to 161.78, 242.61 and 80.60

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Solution

The fourth proportional to 161.78, 242.61 and 80.60 is: 120.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.78 : 242.61 = 80.60 : x
  2. Step 2: Convert to fraction form
    161.78/242.61 = 80.60/x
  3. Step 3: Cross multiply
    161.78x = 242.61 × 80.60
  4. Step 4: Simplify right side
    161.78x = 19,553.15
  5. Step 5: Solve for x
    x = 19,553.15/161.78
  6. Step 6: Final answer
    x = 120.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.