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Finding the Third Proportional to 388.13 and 415.69

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Solution

The third proportional to 388.13 and 415.69 is: 445.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.13 : 415.69 = 415.69 : x
  2. Step 2: Convert to fraction form
    388.13/415.69 = 415.69/x
  3. Step 3: Cross multiply
    388.13x = 415.69 × 415.69
  4. Step 4: Simplify right side
    388.13x = 172,796.10
  5. Step 5: Solve for x
    x = 172,796.10/388.13
  6. Step 6: Final answer
    x = 445.21

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.