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Finding the Third Proportional to 515.11 and 818.86

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Solution

The third proportional to 515.11 and 818.86 is: 1,301.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.11 : 818.86 = 818.86 : x
  2. Step 2: Convert to fraction form
    515.11/818.86 = 818.86/x
  3. Step 3: Cross multiply
    515.11x = 818.86 × 818.86
  4. Step 4: Simplify right side
    515.11x = 670,530.68
  5. Step 5: Solve for x
    x = 670,530.68/515.11
  6. Step 6: Final answer
    x = 1,301.72

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.