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Finding the Third Proportional to 209.30 and 316.09

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Solution

The third proportional to 209.30 and 316.09 is: 477.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.30 : 316.09 = 316.09 : x
  2. Step 2: Convert to fraction form
    209.30/316.09 = 316.09/x
  3. Step 3: Cross multiply
    209.30x = 316.09 × 316.09
  4. Step 4: Simplify right side
    209.30x = 99,912.79
  5. Step 5: Solve for x
    x = 99,912.79/209.30
  6. Step 6: Final answer
    x = 477.36

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.