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Finding the Fourth Proportional to 197.78, 297.21 and 163.22

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Solution

The fourth proportional to 197.78, 297.21 and 163.22 is: 245.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.78 : 297.21 = 163.22 : x
  2. Step 2: Convert to fraction form
    197.78/297.21 = 163.22/x
  3. Step 3: Cross multiply
    197.78x = 297.21 × 163.22
  4. Step 4: Simplify right side
    197.78x = 48,510.62
  5. Step 5: Solve for x
    x = 48,510.62/197.78
  6. Step 6: Final answer
    x = 245.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.