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Finding the Fourth Proportional to 161.36, 242.12 and 80.18

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Solution

The fourth proportional to 161.36, 242.12 and 80.18 is: 120.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.36 : 242.12 = 80.18 : x
  2. Step 2: Convert to fraction form
    161.36/242.12 = 80.18/x
  3. Step 3: Cross multiply
    161.36x = 242.12 × 80.18
  4. Step 4: Simplify right side
    161.36x = 19,413.18
  5. Step 5: Solve for x
    x = 19,413.18/161.36
  6. Step 6: Final answer
    x = 120.31

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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.