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Finding the Fourth Proportional to 163.90, 226.20 and 105.76

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Solution

The fourth proportional to 163.90, 226.20 and 105.76 is: 145.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.90 : 226.20 = 105.76 : x
  2. Step 2: Convert to fraction form
    163.90/226.20 = 105.76/x
  3. Step 3: Cross multiply
    163.90x = 226.20 × 105.76
  4. Step 4: Simplify right side
    163.90x = 23,922.91
  5. Step 5: Solve for x
    x = 23,922.91/163.90
  6. Step 6: Final answer
    x = 145.96

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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.