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Finding the Fourth Proportional to 111.29, 166.79 and 82.53

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Solution

The fourth proportional to 111.29, 166.79 and 82.53 is: 123.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.29 : 166.79 = 82.53 : x
  2. Step 2: Convert to fraction form
    111.29/166.79 = 82.53/x
  3. Step 3: Cross multiply
    111.29x = 166.79 × 82.53
  4. Step 4: Simplify right side
    111.29x = 13,765.39
  5. Step 5: Solve for x
    x = 13,765.39/111.29
  6. Step 6: Final answer
    x = 123.69

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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.