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Finding the Third Proportional to 644.25 and 980.25

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Solution

The third proportional to 644.25 and 980.25 is: 1,491.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.25 : 980.25 = 980.25 : x
  2. Step 2: Convert to fraction form
    644.25/980.25 = 980.25/x
  3. Step 3: Cross multiply
    644.25x = 980.25 × 980.25
  4. Step 4: Simplify right side
    644.25x = 960,890.06
  5. Step 5: Solve for x
    x = 960,890.06/644.25
  6. Step 6: Final answer
    x = 1,491.49

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.