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Finding the Third Proportional to 689.25 and 982.25

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Solution

The third proportional to 689.25 and 982.25 is: 1,399.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.25 : 982.25 = 982.25 : x
  2. Step 2: Convert to fraction form
    689.25/982.25 = 982.25/x
  3. Step 3: Cross multiply
    689.25x = 982.25 × 982.25
  4. Step 4: Simplify right side
    689.25x = 964,815.06
  5. Step 5: Solve for x
    x = 964,815.06/689.25
  6. Step 6: Final answer
    x = 1,399.80

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.