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Finding the Third Proportional to 393.19 and 405.84

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Solution

The third proportional to 393.19 and 405.84 is: 418.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.19 : 405.84 = 405.84 : x
  2. Step 2: Convert to fraction form
    393.19/405.84 = 405.84/x
  3. Step 3: Cross multiply
    393.19x = 405.84 × 405.84
  4. Step 4: Simplify right side
    393.19x = 164,709.15
  5. Step 5: Solve for x
    x = 164,709.15/393.19
  6. Step 6: Final answer
    x = 418.91

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.