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Finding the Fourth Proportional to 163.78, 225.90 and 108.49

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Solution

The fourth proportional to 163.78, 225.90 and 108.49 is: 149.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.78 : 225.90 = 108.49 : x
  2. Step 2: Convert to fraction form
    163.78/225.90 = 108.49/x
  3. Step 3: Cross multiply
    163.78x = 225.90 × 108.49
  4. Step 4: Simplify right side
    163.78x = 24,507.89
  5. Step 5: Solve for x
    x = 24,507.89/163.78
  6. Step 6: Final answer
    x = 149.64

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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.