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Finding the Fourth Proportional to 144.09, 198.81 and 108.68

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Solution

The fourth proportional to 144.09, 198.81 and 108.68 is: 149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.09 : 198.81 = 108.68 : x
  2. Step 2: Convert to fraction form
    144.09/198.81 = 108.68/x
  3. Step 3: Cross multiply
    144.09x = 198.81 × 108.68
  4. Step 4: Simplify right side
    144.09x = 21,607.01
  5. Step 5: Solve for x
    x = 21,607.01/144.09
  6. Step 6: Final answer
    x = 149.96

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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.