The ratios are .
(Write the proportion)
(Form cross products)
(Multiply: )
The ratios form a proportion.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=890a12d72882b7040cbfc5e2848adeb2.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4a43a1fc07e82d30cc7f4de1b01eaca3.png\")
(Write the proportion) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=15aa0fe52287dd58ba02e551ca917d7c.png\")
(Form cross products) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=29464517ca3a91be6955cb2a8a14e241.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e8c6b33ec3e100e627c0c38dbefa23a9.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")