The given proportion is .
(Write the proportion)
(Cross products)
(Multiply)
(Divide each side by 21)
The solution is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dcb8ffe018b342043f2d9779dbd506b4.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dcb8ffe018b342043f2d9779dbd506b4.png\")
(Write the proportion)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d65382885dd158ac59c0d8eaeeb022e5.png\")
(Cross products)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=82f4bb92cc3477965d141e74a7d2154b.png\")
(Multiply)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a0912fb3a1aed29cf9d545cf0326c5c7.png\")
(Divide each side by 21)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
.