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Finding the Fourth Proportional to 163.76, 225.79 and 128.72

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Solution

The fourth proportional to 163.76, 225.79 and 128.72 is: 177.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.76 : 225.79 = 128.72 : x
  2. Step 2: Convert to fraction form
    163.76/225.79 = 128.72/x
  3. Step 3: Cross multiply
    163.76x = 225.79 × 128.72
  4. Step 4: Simplify right side
    163.76x = 29,063.93
  5. Step 5: Solve for x
    x = 29,063.93/163.76
  6. Step 6: Final answer
    x = 177.48

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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.