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Finding the Third Proportional to 316,986 and 690,836

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Solution

The third proportional to 316,986 and 690,836 is: 1,505,600.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,986 : 690,836 = 690,836 : x
  2. Step 2: Convert to fraction form
    316,986/690,836 = 690,836/x
  3. Step 3: Cross multiply
    316,986x = 690,836 × 690,836
  4. Step 4: Simplify right side
    316,986x = 477,254,378,896
  5. Step 5: Solve for x
    x = 477,254,378,896/316,986
  6. Step 6: Final answer
    x = 1,505,600.81

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.