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Finding the Fourth Proportional to 161.86, 242.85 and 80.68

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Solution

The fourth proportional to 161.86, 242.85 and 80.68 is: 121.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.86 : 242.85 = 80.68 : x
  2. Step 2: Convert to fraction form
    161.86/242.85 = 80.68/x
  3. Step 3: Cross multiply
    161.86x = 242.85 × 80.68
  4. Step 4: Simplify right side
    161.86x = 19,593.86
  5. Step 5: Solve for x
    x = 19,593.86/161.86
  6. Step 6: Final answer
    x = 121.05

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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.