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Finding the Fourth Proportional to 137.76, 190.11 and 121.42

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Solution

The fourth proportional to 137.76, 190.11 and 121.42 is: 167.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.76 : 190.11 = 121.42 : x
  2. Step 2: Convert to fraction form
    137.76/190.11 = 121.42/x
  3. Step 3: Cross multiply
    137.76x = 190.11 × 121.42
  4. Step 4: Simplify right side
    137.76x = 23,083.16
  5. Step 5: Solve for x
    x = 23,083.16/137.76
  6. Step 6: Final answer
    x = 167.56

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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.