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Finding the Third Proportional to 302.88 and 408.69

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Solution

The third proportional to 302.88 and 408.69 is: 551.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.88 : 408.69 = 408.69 : x
  2. Step 2: Convert to fraction form
    302.88/408.69 = 408.69/x
  3. Step 3: Cross multiply
    302.88x = 408.69 × 408.69
  4. Step 4: Simplify right side
    302.88x = 167,025.47
  5. Step 5: Solve for x
    x = 167,025.47/302.88
  6. Step 6: Final answer
    x = 551.47

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.