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Finding the Third Proportional to 392 and 516

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Solution

The third proportional to 392 and 516 is: 679.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    392 : 516 = 516 : x
  2. Step 2: Convert to fraction form
    392/516 = 516/x
  3. Step 3: Cross multiply
    392x = 516 × 516
  4. Step 4: Simplify right side
    392x = 266,256
  5. Step 5: Solve for x
    x = 266,256/392
  6. Step 6: Final answer
    x = 679.22

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These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.