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Finding the Fourth Proportional to 163.41, 225.34 and 128.58

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Solution

The fourth proportional to 163.41, 225.34 and 128.58 is: 177.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.41 : 225.34 = 128.58 : x
  2. Step 2: Convert to fraction form
    163.41/225.34 = 128.58/x
  3. Step 3: Cross multiply
    163.41x = 225.34 × 128.58
  4. Step 4: Simplify right side
    163.41x = 28,974.22
  5. Step 5: Solve for x
    x = 28,974.22/163.41
  6. Step 6: Final answer
    x = 177.31

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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.