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Finding the Third Proportional to 328.88 and 415.69

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Solution

The third proportional to 328.88 and 415.69 is: 525.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.88 : 415.69 = 415.69 : x
  2. Step 2: Convert to fraction form
    328.88/415.69 = 415.69/x
  3. Step 3: Cross multiply
    328.88x = 415.69 × 415.69
  4. Step 4: Simplify right side
    328.88x = 172,796.10
  5. Step 5: Solve for x
    x = 172,796.10/328.88
  6. Step 6: Final answer
    x = 525.42

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Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.