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Finding the Fourth Proportional to 137.94, 205.77 and 121.91

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Solution

The fourth proportional to 137.94, 205.77 and 121.91 is: 181.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.94 : 205.77 = 121.91 : x
  2. Step 2: Convert to fraction form
    137.94/205.77 = 121.91/x
  3. Step 3: Cross multiply
    137.94x = 205.77 × 121.91
  4. Step 4: Simplify right side
    137.94x = 25,084.85
  5. Step 5: Solve for x
    x = 25,084.85/137.94
  6. Step 6: Final answer
    x = 181.86

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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.