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Finding the Fourth Proportional to 163.11, 244.54 and 128.79

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Solution

The fourth proportional to 163.11, 244.54 and 128.79 is: 193.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.11 : 244.54 = 128.79 : x
  2. Step 2: Convert to fraction form
    163.11/244.54 = 128.79/x
  3. Step 3: Cross multiply
    163.11x = 244.54 × 128.79
  4. Step 4: Simplify right side
    163.11x = 31,494.31
  5. Step 5: Solve for x
    x = 31,494.31/163.11
  6. Step 6: Final answer
    x = 193.09

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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.