(8)
Check to ensure corresponding units of the proportion are the same
and then work the problem by the four-step method.
The proportion should be as follows:
250 mg_______ =
150 mg_____
5 milliliters
X milliliters
(9)
Solve this proportion by using the four step method:
(a) Set up the proportion:
(b) Cross multiply:
(c) Solve for x:
(d) Refer back to step 1 to find the units for X:
(10)
Solution:
(a) Set up formula:
250 mg = 150 mg
5 ml
X ml
(b) Cross multiply:
250 (X) = 5 (150)
250X
= 750
(c) Solve for X:
X=
750
250
X=
3
(d) Refer to step 1 to find the units of X:
X = 3 ml
MD0802
1-38