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Finding the Third Proportional to 139,686 and 305,580

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Solution

The third proportional to 139,686 and 305,580 is: 668,493.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,686 : 305,580 = 305,580 : x
  2. Step 2: Convert to fraction form
    139,686/305,580 = 305,580/x
  3. Step 3: Cross multiply
    139,686x = 305,580 × 305,580
  4. Step 4: Simplify right side
    139,686x = 93,379,136,400
  5. Step 5: Solve for x
    x = 93,379,136,400/139,686
  6. Step 6: Final answer
    x = 668,493.17

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.