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Finding the Third Proportional to 310.92 and 415.55

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Solution

The third proportional to 310.92 and 415.55 is: 555.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.92 : 415.55 = 415.55 : x
  2. Step 2: Convert to fraction form
    310.92/415.55 = 415.55/x
  3. Step 3: Cross multiply
    310.92x = 415.55 × 415.55
  4. Step 4: Simplify right side
    310.92x = 172,679.21
  5. Step 5: Solve for x
    x = 172,679.21/310.92
  6. Step 6: Final answer
    x = 555.38

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.