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Finding the Fourth Proportional to 206.75, 309.78 and 125.61

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Solution

The fourth proportional to 206.75, 309.78 and 125.61 is: 188.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.75 : 309.78 = 125.61 : x
  2. Step 2: Convert to fraction form
    206.75/309.78 = 125.61/x
  3. Step 3: Cross multiply
    206.75x = 309.78 × 125.61
  4. Step 4: Simplify right side
    206.75x = 38,911.47
  5. Step 5: Solve for x
    x = 38,911.47/206.75
  6. Step 6: Final answer
    x = 188.21

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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.