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Finding the Fourth Proportional to 161.29, 242 and 80.12

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Solution

The fourth proportional to 161.29, 242 and 80.12 is: 120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.29 : 242 = 80.12 : x
  2. Step 2: Convert to fraction form
    161.29/242 = 80.12/x
  3. Step 3: Cross multiply
    161.29x = 242 × 80.12
  4. Step 4: Simplify right side
    161.29x = 19,389.04
  5. Step 5: Solve for x
    x = 19,389.04/161.29
  6. Step 6: Final answer
    x = 120.21

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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.