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Finding the Fourth Proportional to 206.33, 309.60 and 115.07

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Solution

The fourth proportional to 206.33, 309.60 and 115.07 is: 172.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.33 : 309.60 = 115.07 : x
  2. Step 2: Convert to fraction form
    206.33/309.60 = 115.07/x
  3. Step 3: Cross multiply
    206.33x = 309.60 × 115.07
  4. Step 4: Simplify right side
    206.33x = 35,624.12
  5. Step 5: Solve for x
    x = 35,624.12/206.33
  6. Step 6: Final answer
    x = 172.66

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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.