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Finding the Third Proportional to 689.91 and 885.75

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Solution

The third proportional to 689.91 and 885.75 is: 1,137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.91 : 885.75 = 885.75 : x
  2. Step 2: Convert to fraction form
    689.91/885.75 = 885.75/x
  3. Step 3: Cross multiply
    689.91x = 885.75 × 885.75
  4. Step 4: Simplify right side
    689.91x = 784,553.06
  5. Step 5: Solve for x
    x = 784,553.06/689.91
  6. Step 6: Final answer
    x = 1,137.19

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.