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Finding the Fourth Proportional to 111.30, 166.67 and 85.51

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Solution

The fourth proportional to 111.30, 166.67 and 85.51 is: 128.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.30 : 166.67 = 85.51 : x
  2. Step 2: Convert to fraction form
    111.30/166.67 = 85.51/x
  3. Step 3: Cross multiply
    111.30x = 166.67 × 85.51
  4. Step 4: Simplify right side
    111.30x = 14,251.95
  5. Step 5: Solve for x
    x = 14,251.95/111.30
  6. Step 6: Final answer
    x = 128.06

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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.