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Finding the Fourth Proportional to 163.47, 225.71 and 128.67

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Solution

The fourth proportional to 163.47, 225.71 and 128.67 is: 177.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.47 : 225.71 = 128.67 : x
  2. Step 2: Convert to fraction form
    163.47/225.71 = 128.67/x
  3. Step 3: Cross multiply
    163.47x = 225.71 × 128.67
  4. Step 4: Simplify right side
    163.47x = 29,040.33
  5. Step 5: Solve for x
    x = 29,040.33/163.47
  6. Step 6: Final answer
    x = 177.65

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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.