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Finding the Third Proportional to 209.75 and 307.75

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Solution

The third proportional to 209.75 and 307.75 is: 451.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.75 : 307.75 = 307.75 : x
  2. Step 2: Convert to fraction form
    209.75/307.75 = 307.75/x
  3. Step 3: Cross multiply
    209.75x = 307.75 × 307.75
  4. Step 4: Simplify right side
    209.75x = 94,710.06
  5. Step 5: Solve for x
    x = 94,710.06/209.75
  6. Step 6: Final answer
    x = 451.54

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.