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Finding the Fourth Proportional to 111.28, 166.87 and 39.12

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Solution

The fourth proportional to 111.28, 166.87 and 39.12 is: 58.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 166.87 = 39.12 : x
  2. Step 2: Convert to fraction form
    111.28/166.87 = 39.12/x
  3. Step 3: Cross multiply
    111.28x = 166.87 × 39.12
  4. Step 4: Simplify right side
    111.28x = 6,527.93
  5. Step 5: Solve for x
    x = 6,527.93/111.28
  6. Step 6: Final answer
    x = 58.66

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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.