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Finding the Fourth Proportional to 111.28, 166.07 and 108.40

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Solution

The fourth proportional to 111.28, 166.07 and 108.40 is: 161.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.28 : 166.07 = 108.40 : x
  2. Step 2: Convert to fraction form
    111.28/166.07 = 108.40/x
  3. Step 3: Cross multiply
    111.28x = 166.07 × 108.40
  4. Step 4: Simplify right side
    111.28x = 18,001.99
  5. Step 5: Solve for x
    x = 18,001.99/111.28
  6. Step 6: Final answer
    x = 161.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.