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Finding the Fourth Proportional to 206.12, 309.09 and 84.38

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Solution

The fourth proportional to 206.12, 309.09 and 84.38 is: 126.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.12 : 309.09 = 84.38 : x
  2. Step 2: Convert to fraction form
    206.12/309.09 = 84.38/x
  3. Step 3: Cross multiply
    206.12x = 309.09 × 84.38
  4. Step 4: Simplify right side
    206.12x = 26,081.01
  5. Step 5: Solve for x
    x = 26,081.01/206.12
  6. Step 6: Final answer
    x = 126.53

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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.