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Finding the Fourth Proportional to 111.75, 167.44 and 91.08

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Solution

The fourth proportional to 111.75, 167.44 and 91.08 is: 136.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.75 : 167.44 = 91.08 : x
  2. Step 2: Convert to fraction form
    111.75/167.44 = 91.08/x
  3. Step 3: Cross multiply
    111.75x = 167.44 × 91.08
  4. Step 4: Simplify right side
    111.75x = 15,249.60
  5. Step 5: Solve for x
    x = 15,249.60/111.75
  6. Step 6: Final answer
    x = 136.46

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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.