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Finding the Third Proportional to 771.38 and 1,687.88

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Solution

The third proportional to 771.38 and 1,687.88 is: 3,693.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.38 : 1,687.88 = 1,687.88 : x
  2. Step 2: Convert to fraction form
    771.38/1,687.88 = 1,687.88/x
  3. Step 3: Cross multiply
    771.38x = 1,687.88 × 1,687.88
  4. Step 4: Simplify right side
    771.38x = 2,848,922.02
  5. Step 5: Solve for x
    x = 2,848,922.02/771.38
  6. Step 6: Final answer
    x = 3,693.30

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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.