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Finding the Third Proportional to 205.75 and 428.50

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Solution

The third proportional to 205.75 and 428.50 is: 892.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.75 : 428.50 = 428.50 : x
  2. Step 2: Convert to fraction form
    205.75/428.50 = 428.50/x
  3. Step 3: Cross multiply
    205.75x = 428.50 × 428.50
  4. Step 4: Simplify right side
    205.75x = 183,612.25
  5. Step 5: Solve for x
    x = 183,612.25/205.75
  6. Step 6: Final answer
    x = 892.40

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.