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Finding the Fourth Proportional to 111.81, 155.15 and 108.41

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Solution

The fourth proportional to 111.81, 155.15 and 108.41 is: 150.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.81 : 155.15 = 108.41 : x
  2. Step 2: Convert to fraction form
    111.81/155.15 = 108.41/x
  3. Step 3: Cross multiply
    111.81x = 155.15 × 108.41
  4. Step 4: Simplify right side
    111.81x = 16,818.90
  5. Step 5: Solve for x
    x = 16,818.90/111.81
  6. Step 6: Final answer
    x = 150.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.