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Finding the Fourth Proportional to 161.67, 222.98 and 115.20

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Solution

The fourth proportional to 161.67, 222.98 and 115.20 is: 158.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.67 : 222.98 = 115.20 : x
  2. Step 2: Convert to fraction form
    161.67/222.98 = 115.20/x
  3. Step 3: Cross multiply
    161.67x = 222.98 × 115.20
  4. Step 4: Simplify right side
    161.67x = 25,686.72
  5. Step 5: Solve for x
    x = 25,686.72/161.67
  6. Step 6: Final answer
    x = 158.88

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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.