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Finding the Third Proportional to 185.20 and 405.28

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Solution

The third proportional to 185.20 and 405.28 is: 886.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.20 : 405.28 = 405.28 : x
  2. Step 2: Convert to fraction form
    185.20/405.28 = 405.28/x
  3. Step 3: Cross multiply
    185.20x = 405.28 × 405.28
  4. Step 4: Simplify right side
    185.20x = 164,252.89
  5. Step 5: Solve for x
    x = 164,252.89/185.20
  6. Step 6: Final answer
    x = 886.88

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.