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Finding the Fourth Proportional to 161.18, 222.17 and 131.79

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Solution

The fourth proportional to 161.18, 222.17 and 131.79 is: 181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.18 : 222.17 = 131.79 : x
  2. Step 2: Convert to fraction form
    161.18/222.17 = 131.79/x
  3. Step 3: Cross multiply
    161.18x = 222.17 × 131.79
  4. Step 4: Simplify right side
    161.18x = 29,279.78
  5. Step 5: Solve for x
    x = 29,279.78/161.18
  6. Step 6: Final answer
    x = 181.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.