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Finding the Third Proportional to 391.25 and 802.75

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Solution

The third proportional to 391.25 and 802.75 is: 1,647.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 802.75 = 802.75 : x
  2. Step 2: Convert to fraction form
    391.25/802.75 = 802.75/x
  3. Step 3: Cross multiply
    391.25x = 802.75 × 802.75
  4. Step 4: Simplify right side
    391.25x = 644,407.56
  5. Step 5: Solve for x
    x = 644,407.56/391.25
  6. Step 6: Final answer
    x = 1,647.05

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.