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Finding the Third Proportional to 391.13 and 587.81

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Solution

The third proportional to 391.13 and 587.81 is: 883.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.13 : 587.81 = 587.81 : x
  2. Step 2: Convert to fraction form
    391.13/587.81 = 587.81/x
  3. Step 3: Cross multiply
    391.13x = 587.81 × 587.81
  4. Step 4: Simplify right side
    391.13x = 345,523.54
  5. Step 5: Solve for x
    x = 345,523.54/391.13
  6. Step 6: Final answer
    x = 883.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.