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Finding the Third Proportional to 431.75 and 851.75

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Solution

The third proportional to 431.75 and 851.75 is: 1,680.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.75 : 851.75 = 851.75 : x
  2. Step 2: Convert to fraction form
    431.75/851.75 = 851.75/x
  3. Step 3: Cross multiply
    431.75x = 851.75 × 851.75
  4. Step 4: Simplify right side
    431.75x = 725,478.06
  5. Step 5: Solve for x
    x = 725,478.06/431.75
  6. Step 6: Final answer
    x = 1,680.32

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.