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Finding the Fourth Proportional to 144.15, 198.71 and 102.68

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Solution

The fourth proportional to 144.15, 198.71 and 102.68 is: 141.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.15 : 198.71 = 102.68 : x
  2. Step 2: Convert to fraction form
    144.15/198.71 = 102.68/x
  3. Step 3: Cross multiply
    144.15x = 198.71 × 102.68
  4. Step 4: Simplify right side
    144.15x = 20,404.86
  5. Step 5: Solve for x
    x = 20,404.86/144.15
  6. Step 6: Final answer
    x = 141.56

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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.