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Finding the Fourth Proportional to 138.44, 206.50 and 121.52

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Solution

The fourth proportional to 138.44, 206.50 and 121.52 is: 181.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.44 : 206.50 = 121.52 : x
  2. Step 2: Convert to fraction form
    138.44/206.50 = 121.52/x
  3. Step 3: Cross multiply
    138.44x = 206.50 × 121.52
  4. Step 4: Simplify right side
    138.44x = 25,093.88
  5. Step 5: Solve for x
    x = 25,093.88/138.44
  6. Step 6: Final answer
    x = 181.26

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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.