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Finding the Third Proportional to 405 and 665.25

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Solution

The third proportional to 405 and 665.25 is: 1,092.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 665.25 = 665.25 : x
  2. Step 2: Convert to fraction form
    405/665.25 = 665.25/x
  3. Step 3: Cross multiply
    405x = 665.25 × 665.25
  4. Step 4: Simplify right side
    405x = 442,557.56
  5. Step 5: Solve for x
    x = 442,557.56/405
  6. Step 6: Final answer
    x = 1,092.73

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.