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Finding the Fourth Proportional to 163.91, 226.20 and 111.55

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Solution

The fourth proportional to 163.91, 226.20 and 111.55 is: 153.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.91 : 226.20 = 111.55 : x
  2. Step 2: Convert to fraction form
    163.91/226.20 = 111.55/x
  3. Step 3: Cross multiply
    163.91x = 226.20 × 111.55
  4. Step 4: Simplify right side
    163.91x = 25,233.21
  5. Step 5: Solve for x
    x = 25,233.21/163.91
  6. Step 6: Final answer
    x = 153.95

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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.