The ratios are .
(Write the proportion)
(Form cross products)
(Multiply: )
The ratios does not form a proportion.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ff41f8b0f1cc4977b021c7e64ca737cc.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2c1eee9cfda0db37b3f3029489c9e665.png\")
(Write the proportion) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=55223defdfde38ada7b9f7113d0e9396.png\")
(Form cross products) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fc3e2669ca31cee1a007b4017723ea22.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0048a64a999258db4b7e314d498b1548.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")