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Finding the Fourth Proportional to 111.29, 166.77 and 89.66

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Solution

The fourth proportional to 111.29, 166.77 and 89.66 is: 134.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.29 : 166.77 = 89.66 : x
  2. Step 2: Convert to fraction form
    111.29/166.77 = 89.66/x
  3. Step 3: Cross multiply
    111.29x = 166.77 × 89.66
  4. Step 4: Simplify right side
    111.29x = 14,951.76
  5. Step 5: Solve for x
    x = 14,951.76/111.29
  6. Step 6: Final answer
    x = 134.36

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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.