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Finding the Third Proportional to 206.81 and 403.13

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Solution

The third proportional to 206.81 and 403.13 is: 785.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.81 : 403.13 = 403.13 : x
  2. Step 2: Convert to fraction form
    206.81/403.13 = 403.13/x
  3. Step 3: Cross multiply
    206.81x = 403.13 × 403.13
  4. Step 4: Simplify right side
    206.81x = 162,509.77
  5. Step 5: Solve for x
    x = 162,509.77/206.81
  6. Step 6: Final answer
    x = 785.78

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.