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Finding the Fourth Proportional to 144.74, 200.85 and 138.66

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Solution

The fourth proportional to 144.74, 200.85 and 138.66 is: 192.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.74 : 200.85 = 138.66 : x
  2. Step 2: Convert to fraction form
    144.74/200.85 = 138.66/x
  3. Step 3: Cross multiply
    144.74x = 200.85 × 138.66
  4. Step 4: Simplify right side
    144.74x = 27,849.86
  5. Step 5: Solve for x
    x = 27,849.86/144.74
  6. Step 6: Final answer
    x = 192.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.