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Finding the Third Proportional to 685 and 1,477

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Solution

The third proportional to 685 and 1,477 is: 3,184.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    685 : 1,477 = 1,477 : x
  2. Step 2: Convert to fraction form
    685/1,477 = 1,477/x
  3. Step 3: Cross multiply
    685x = 1,477 × 1,477
  4. Step 4: Simplify right side
    685x = 2,181,529
  5. Step 5: Solve for x
    x = 2,181,529/685
  6. Step 6: Final answer
    x = 3,184.71

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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.