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Finding the Fourth Proportional to 163.72, 244.86 and 138.28

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Solution

The fourth proportional to 163.72, 244.86 and 138.28 is: 206.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.72 : 244.86 = 138.28 : x
  2. Step 2: Convert to fraction form
    163.72/244.86 = 138.28/x
  3. Step 3: Cross multiply
    163.72x = 244.86 × 138.28
  4. Step 4: Simplify right side
    163.72x = 33,859.24
  5. Step 5: Solve for x
    x = 33,859.24/163.72
  6. Step 6: Final answer
    x = 206.81

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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.