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Finding the Third Proportional to 1,978 and 3,640

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Solution

The third proportional to 1,978 and 3,640 is: 6,698.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978 : 3,640 = 3,640 : x
  2. Step 2: Convert to fraction form
    1,978/3,640 = 3,640/x
  3. Step 3: Cross multiply
    1,978x = 3,640 × 3,640
  4. Step 4: Simplify right side
    1,978x = 13,249,600
  5. Step 5: Solve for x
    x = 13,249,600/1,978
  6. Step 6: Final answer
    x = 6,698.48

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.