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Finding the Fourth Proportional to 163.75, 226.16 and 111.91

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Solution

The fourth proportional to 163.75, 226.16 and 111.91 is: 154.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.75 : 226.16 = 111.91 : x
  2. Step 2: Convert to fraction form
    163.75/226.16 = 111.91/x
  3. Step 3: Cross multiply
    163.75x = 226.16 × 111.91
  4. Step 4: Simplify right side
    163.75x = 25,309.57
  5. Step 5: Solve for x
    x = 25,309.57/163.75
  6. Step 6: Final answer
    x = 154.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.