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Finding the Third Proportional to 672.75 and 812.25

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Solution

The third proportional to 672.75 and 812.25 is: 980.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.75 : 812.25 = 812.25 : x
  2. Step 2: Convert to fraction form
    672.75/812.25 = 812.25/x
  3. Step 3: Cross multiply
    672.75x = 812.25 × 812.25
  4. Step 4: Simplify right side
    672.75x = 659,750.06
  5. Step 5: Solve for x
    x = 659,750.06/672.75
  6. Step 6: Final answer
    x = 980.68

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.