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Finding the Third Proportional to 645.75 and 1,395

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Solution

The third proportional to 645.75 and 1,395 is: 3,013.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.75 : 1,395 = 1,395 : x
  2. Step 2: Convert to fraction form
    645.75/1,395 = 1,395/x
  3. Step 3: Cross multiply
    645.75x = 1,395 × 1,395
  4. Step 4: Simplify right side
    645.75x = 1,946,025
  5. Step 5: Solve for x
    x = 1,946,025/645.75
  6. Step 6: Final answer
    x = 3,013.59

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.