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Finding the Fourth Proportional to 206.22, 309.36 and 115.11

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Solution

The fourth proportional to 206.22, 309.36 and 115.11 is: 172.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.22 : 309.36 = 115.11 : x
  2. Step 2: Convert to fraction form
    206.22/309.36 = 115.11/x
  3. Step 3: Cross multiply
    206.22x = 309.36 × 115.11
  4. Step 4: Simplify right side
    206.22x = 35,610.43
  5. Step 5: Solve for x
    x = 35,610.43/206.22
  6. Step 6: Final answer
    x = 172.68

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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.