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Finding the Fourth Proportional to 118.21, 163.10 and 108.39

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Solution

The fourth proportional to 118.21, 163.10 and 108.39 is: 149.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 163.10 = 108.39 : x
  2. Step 2: Convert to fraction form
    118.21/163.10 = 108.39/x
  3. Step 3: Cross multiply
    118.21x = 163.10 × 108.39
  4. Step 4: Simplify right side
    118.21x = 17,678.41
  5. Step 5: Solve for x
    x = 17,678.41/118.21
  6. Step 6: Final answer
    x = 149.55

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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.