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Finding the Third Proportional to 645.50 and 1,509

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Solution

The third proportional to 645.50 and 1,509 is: 3,527.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.50 : 1,509 = 1,509 : x
  2. Step 2: Convert to fraction form
    645.50/1,509 = 1,509/x
  3. Step 3: Cross multiply
    645.50x = 1,509 × 1,509
  4. Step 4: Simplify right side
    645.50x = 2,277,081
  5. Step 5: Solve for x
    x = 2,277,081/645.50
  6. Step 6: Final answer
    x = 3,527.62

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.