The proportion is , and a, b, c, d are nonzero numbers.
Multiply each side by .
Cancel common terms.
The above statement is true.
Yes, the statement is true.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
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, and a, b, c, d are nonzero numbers.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1b70e6d1e64c5144f253c21a0cb4a672.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e0ab6ed25951397a644972e82b460010.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7d4567209d29b6d2a52953e6abe5cfab.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7d4567209d29b6d2a52953e6abe5cfab.png\")
is true.