This indicates that a is in the same proportion to b as c is in proportion to d.
In other words if a is half of b then c is half of d.
Or, if a is one third of b then c is one third of d.
The numbers could be anything as long as they are in the correct proportion: a=500 b=1000 c=4 d=8
satisfies the relationship: a:b=c:d. Because a is half of b and c is half of d.
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