5 by 3
3rd one
there we have to find hypotenuse.
25=2,500, 278= 27800%, 2.9=290, 3.0=300, 0.67= 67
Where is the question? Are you playing solitaire
We can set this up as a proportion.
Since 2 is proportional to 1000, then 4 is proportional to "doctors surveyed".

where d is the doctors surveyed.
Cross multiply.
2d = 4000
d=2000
2000 doctors were surveyed.