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Finding the Fourth Proportional to 206.60, 309.98 and 115.38

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Solution

The fourth proportional to 206.60, 309.98 and 115.38 is: 173.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.60 : 309.98 = 115.38 : x
  2. Step 2: Convert to fraction form
    206.60/309.98 = 115.38/x
  3. Step 3: Cross multiply
    206.60x = 309.98 × 115.38
  4. Step 4: Simplify right side
    206.60x = 35,765.78
  5. Step 5: Solve for x
    x = 35,765.78/206.60
  6. Step 6: Final answer
    x = 173.12

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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.