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Finding the Third Proportional to 1,284 and 1,640.75

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Solution

The third proportional to 1,284 and 1,640.75 is: 2,096.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284 : 1,640.75 = 1,640.75 : x
  2. Step 2: Convert to fraction form
    1,284/1,640.75 = 1,640.75/x
  3. Step 3: Cross multiply
    1,284x = 1,640.75 × 1,640.75
  4. Step 4: Simplify right side
    1,284x = 2,692,060.56
  5. Step 5: Solve for x
    x = 2,692,060.56/1,284
  6. Step 6: Final answer
    x = 2,096.62

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.