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Finding the Third Proportional to 393 and 812.25

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Solution

The third proportional to 393 and 812.25 is: 1,678.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    393 : 812.25 = 812.25 : x
  2. Step 2: Convert to fraction form
    393/812.25 = 812.25/x
  3. Step 3: Cross multiply
    393x = 812.25 × 812.25
  4. Step 4: Simplify right side
    393x = 659,750.06
  5. Step 5: Solve for x
    x = 659,750.06/393
  6. Step 6: Final answer
    x = 1,678.75

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.