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Finding the Fourth Proportional to 111.06, 166.30 and 82.13

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Solution

The fourth proportional to 111.06, 166.30 and 82.13 is: 122.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.06 : 166.30 = 82.13 : x
  2. Step 2: Convert to fraction form
    111.06/166.30 = 82.13/x
  3. Step 3: Cross multiply
    111.06x = 166.30 × 82.13
  4. Step 4: Simplify right side
    111.06x = 13,657.88
  5. Step 5: Solve for x
    x = 13,657.88/111.06
  6. Step 6: Final answer
    x = 122.98

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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.