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Finding the Fourth Proportional to 206.73, 309.78 and 125.55

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Solution

The fourth proportional to 206.73, 309.78 and 125.55 is: 188.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.73 : 309.78 = 125.55 : x
  2. Step 2: Convert to fraction form
    206.73/309.78 = 125.55/x
  3. Step 3: Cross multiply
    206.73x = 309.78 × 125.55
  4. Step 4: Simplify right side
    206.73x = 38,892.88
  5. Step 5: Solve for x
    x = 38,892.88/206.73
  6. Step 6: Final answer
    x = 188.13

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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.