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Finding the Fourth Proportional to 163.89, 226.20 and 111.51

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Solution

The fourth proportional to 163.89, 226.20 and 111.51 is: 153.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.89 : 226.20 = 111.51 : x
  2. Step 2: Convert to fraction form
    163.89/226.20 = 111.51/x
  3. Step 3: Cross multiply
    163.89x = 226.20 × 111.51
  4. Step 4: Simplify right side
    163.89x = 25,223.56
  5. Step 5: Solve for x
    x = 25,223.56/163.89
  6. Step 6: Final answer
    x = 153.91

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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.