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Finding the Third Proportional to 289.75 and 394.38

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Solution

The third proportional to 289.75 and 394.38 is: 536.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.75 : 394.38 = 394.38 : x
  2. Step 2: Convert to fraction form
    289.75/394.38 = 394.38/x
  3. Step 3: Cross multiply
    289.75x = 394.38 × 394.38
  4. Step 4: Simplify right side
    289.75x = 155,531.64
  5. Step 5: Solve for x
    x = 155,531.64/289.75
  6. Step 6: Final answer
    x = 536.78

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.