The proportion is
.
Apply cross product property: If
,then
.
(Cross products)
(Multiply:
)
(Apply distributive property:
)
(Multiply:
)
Apply subtraction property of equality: Subtract 27 from each side.
\
(Apply additive inverse property:
)
(Subtract:
)
Apply division property of equality: Divide each side by negative 9.
\
(Cancel common terms)
(Divide:
)
The value of
.