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Finding the Fourth Proportional to 161.72, 242.61 and 80.52

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Solution

The fourth proportional to 161.72, 242.61 and 80.52 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.72 : 242.61 = 80.52 : x
  2. Step 2: Convert to fraction form
    161.72/242.61 = 80.52/x
  3. Step 3: Cross multiply
    161.72x = 242.61 × 80.52
  4. Step 4: Simplify right side
    161.72x = 19,534.96
  5. Step 5: Solve for x
    x = 19,534.96/161.72
  6. Step 6: Final answer
    x = 120.79

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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.