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Finding the Fourth Proportional to 111.58, 167.22 and 103.90

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Solution

The fourth proportional to 111.58, 167.22 and 103.90 is: 155.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.58 : 167.22 = 103.90 : x
  2. Step 2: Convert to fraction form
    111.58/167.22 = 103.90/x
  3. Step 3: Cross multiply
    111.58x = 167.22 × 103.90
  4. Step 4: Simplify right side
    111.58x = 17,374.16
  5. Step 5: Solve for x
    x = 17,374.16/111.58
  6. Step 6: Final answer
    x = 155.71

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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.