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Finding the Fourth Proportional to 137.44, 205.08 and 121.28

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Solution

The fourth proportional to 137.44, 205.08 and 121.28 is: 180.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.44 : 205.08 = 121.28 : x
  2. Step 2: Convert to fraction form
    137.44/205.08 = 121.28/x
  3. Step 3: Cross multiply
    137.44x = 205.08 × 121.28
  4. Step 4: Simplify right side
    137.44x = 24,872.10
  5. Step 5: Solve for x
    x = 24,872.10/137.44
  6. Step 6: Final answer
    x = 180.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.