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Finding the Fourth Proportional to 163.80, 226.20 and 111.36

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Solution

The fourth proportional to 163.80, 226.20 and 111.36 is: 153.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.80 : 226.20 = 111.36 : x
  2. Step 2: Convert to fraction form
    163.80/226.20 = 111.36/x
  3. Step 3: Cross multiply
    163.80x = 226.20 × 111.36
  4. Step 4: Simplify right side
    163.80x = 25,189.63
  5. Step 5: Solve for x
    x = 25,189.63/163.80
  6. Step 6: Final answer
    x = 153.78

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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.