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Finding the Fourth Proportional to 206.44, 309.90 and 121

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Solution

The fourth proportional to 206.44, 309.90 and 121 is: 181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.44 : 309.90 = 121 : x
  2. Step 2: Convert to fraction form
    206.44/309.90 = 121/x
  3. Step 3: Cross multiply
    206.44x = 309.90 × 121
  4. Step 4: Simplify right side
    206.44x = 37,497.90
  5. Step 5: Solve for x
    x = 37,497.90/206.44
  6. Step 6: Final answer
    x = 181.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.