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Finding the Third Proportional to 379.88 and 831.19

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Solution

The third proportional to 379.88 and 831.19 is: 1,818.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.88 : 831.19 = 831.19 : x
  2. Step 2: Convert to fraction form
    379.88/831.19 = 831.19/x
  3. Step 3: Cross multiply
    379.88x = 831.19 × 831.19
  4. Step 4: Simplify right side
    379.88x = 690,872.66
  5. Step 5: Solve for x
    x = 690,872.66/379.88
  6. Step 6: Final answer
    x = 1,818.68

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.