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Finding the Fourth Proportional to 111.03, 166.23 and 85.20

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Solution

The fourth proportional to 111.03, 166.23 and 85.20 is: 127.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.03 : 166.23 = 85.20 : x
  2. Step 2: Convert to fraction form
    111.03/166.23 = 85.20/x
  3. Step 3: Cross multiply
    111.03x = 166.23 × 85.20
  4. Step 4: Simplify right side
    111.03x = 14,162.80
  5. Step 5: Solve for x
    x = 14,162.80/111.03
  6. Step 6: Final answer
    x = 127.56

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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.