Ⅹ：0.3=0.4：0.8．

解：Ⅹ：0.3=0.4：0.8，
0.8Ⅹ=0.3×0.4，
0.8Ⅹ=0.12，
Ⅹ=．
分析：根據(jù)比例的性質(zhì)，把比例先改寫成兩個(gè)內(nèi)項(xiàng)的積等于兩個(gè)外項(xiàng)的積的形式，再進(jìn)一步求出比例中的未知項(xiàng)．
點(diǎn)評(píng)：此題考查比例性質(zhì)的運(yùn)用即解比例．
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