document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=717402>Question 717402</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the illumination produced by a light source varies inversely as the square of the distance from the source. If the illumination produced 4 feet from a light source is 75 foot candles, find the illumination produced 9 feet from the same source. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #440266 by </B><A HREF=/tutors/aboutme.mpl?userid=jndarrell><B>jndarrell(58)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jndarrell><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=440266\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> To set your proportions, always make sure both sides units match on numerator or denominator. ie cm over in = cm over in NOT cm over in= in over cm.\r<BR>\n" );
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document.write( "For you its:<BR>\n" );
document.write( "distance from lightsource over illumination produced\r<BR>\n" );
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document.write( "4/75 = 9/x<BR>\n" );
document.write( "Cross Multiply<BR>\n" );
document.write( "4x=675<BR>\n" );
document.write( "Divide both sides by 4 to get x alone<BR>\n" );
document.write( "x=168.75\r<BR>\n" );
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document.write( "to check, plug the value for x back into your equation and run it through.\r<BR>\n" );
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document.write( "Don't forget to add the units for your final solution and double check the instructions on rules for rounding....168.75feet </SPAN>\n" );
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