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Finding the Third Proportional to 687.94 and 1,519.88

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Solution

The third proportional to 687.94 and 1,519.88 is: 3,357.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.94 : 1,519.88 = 1,519.88 : x
  2. Step 2: Convert to fraction form
    687.94/1,519.88 = 1,519.88/x
  3. Step 3: Cross multiply
    687.94x = 1,519.88 × 1,519.88
  4. Step 4: Simplify right side
    687.94x = 2,310,020.02
  5. Step 5: Solve for x
    x = 2,310,020.02/687.94
  6. Step 6: Final answer
    x = 3,357.89

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.