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Finding the Fourth Proportional to 163.21, 225.22 and 97.72

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Solution

The fourth proportional to 163.21, 225.22 and 97.72 is: 134.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.21 : 225.22 = 97.72 : x
  2. Step 2: Convert to fraction form
    163.21/225.22 = 97.72/x
  3. Step 3: Cross multiply
    163.21x = 225.22 × 97.72
  4. Step 4: Simplify right side
    163.21x = 22,008.50
  5. Step 5: Solve for x
    x = 22,008.50/163.21
  6. Step 6: Final answer
    x = 134.85

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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.