document.write( "Question 742432: What is the missing number in the proportion 4 : n = 3 : 9 \n" ); document.write( "
Algebra.Com's Answer #452483 by jim_thompson5910(35256)\"\" \"About 
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4 : n = 3 : 9\r
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\n" ); document.write( "\n" ); document.write( "4/n = 3/9\r
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\n" ); document.write( "\n" ); document.write( "4*9 = 3n\r
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\n" ); document.write( "\n" ); document.write( "36 = 3n\r
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\n" ); document.write( "\n" ); document.write( "36/3 = n\r
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\n" ); document.write( "\n" ); document.write( "12 = n\r
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\n" ); document.write( "\n" ); document.write( "n = 12
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