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Finding the Third Proportional to 645.19 and 1,320.75

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Solution

The third proportional to 645.19 and 1,320.75 is: 2,703.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.19 : 1,320.75 = 1,320.75 : x
  2. Step 2: Convert to fraction form
    645.19/1,320.75 = 1,320.75/x
  3. Step 3: Cross multiply
    645.19x = 1,320.75 × 1,320.75
  4. Step 4: Simplify right side
    645.19x = 1,744,380.56
  5. Step 5: Solve for x
    x = 1,744,380.56/645.19
  6. Step 6: Final answer
    x = 2,703.68

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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.