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Finding the Fourth Proportional to 118.69, 163.79 and 72.69

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Solution

The fourth proportional to 118.69, 163.79 and 72.69 is: 100.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.69 : 163.79 = 72.69 : x
  2. Step 2: Convert to fraction form
    118.69/163.79 = 72.69/x
  3. Step 3: Cross multiply
    118.69x = 163.79 × 72.69
  4. Step 4: Simplify right side
    118.69x = 11,905.90
  5. Step 5: Solve for x
    x = 11,905.90/118.69
  6. Step 6: Final answer
    x = 100.31

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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.