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Finding the Fourth Proportional to 163.21, 244.85 and 71.90

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Solution

The fourth proportional to 163.21, 244.85 and 71.90 is: 107.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.21 : 244.85 = 71.90 : x
  2. Step 2: Convert to fraction form
    163.21/244.85 = 71.90/x
  3. Step 3: Cross multiply
    163.21x = 244.85 × 71.90
  4. Step 4: Simplify right side
    163.21x = 17,604.97
  5. Step 5: Solve for x
    x = 17,604.97/163.21
  6. Step 6: Final answer
    x = 107.87

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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.