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Finding the Fourth Proportional to 111.47, 167.21 and 80.89

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Solution

The fourth proportional to 111.47, 167.21 and 80.89 is: 121.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.47 : 167.21 = 80.89 : x
  2. Step 2: Convert to fraction form
    111.47/167.21 = 80.89/x
  3. Step 3: Cross multiply
    111.47x = 167.21 × 80.89
  4. Step 4: Simplify right side
    111.47x = 13,525.62
  5. Step 5: Solve for x
    x = 13,525.62/111.47
  6. Step 6: Final answer
    x = 121.34

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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.