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Finding the Third Proportional to 685 and 1,485

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Solution

The third proportional to 685 and 1,485 is: 3,219.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    685 : 1,485 = 1,485 : x
  2. Step 2: Convert to fraction form
    685/1,485 = 1,485/x
  3. Step 3: Cross multiply
    685x = 1,485 × 1,485
  4. Step 4: Simplify right side
    685x = 2,205,225
  5. Step 5: Solve for x
    x = 2,205,225/685
  6. Step 6: Final answer
    x = 3,219.31

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.