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Finding the Fourth Proportional to 206.43, 309.04 and 137.78

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Solution

The fourth proportional to 206.43, 309.04 and 137.78 is: 206.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.43 : 309.04 = 137.78 : x
  2. Step 2: Convert to fraction form
    206.43/309.04 = 137.78/x
  3. Step 3: Cross multiply
    206.43x = 309.04 × 137.78
  4. Step 4: Simplify right side
    206.43x = 42,580.93
  5. Step 5: Solve for x
    x = 42,580.93/206.43
  6. Step 6: Final answer
    x = 206.27

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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.