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Finding the Third Proportional to 209 and 266.50

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Solution

The third proportional to 209 and 266.50 is: 339.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    209 : 266.50 = 266.50 : x
  2. Step 2: Convert to fraction form
    209/266.50 = 266.50/x
  3. Step 3: Cross multiply
    209x = 266.50 × 266.50
  4. Step 4: Simplify right side
    209x = 71,022.25
  5. Step 5: Solve for x
    x = 71,022.25/209
  6. Step 6: Final answer
    x = 339.82

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.