45 is what percent of 90? Algebra Linear Equations Percent Equations 1 Answer Azimet Jan 19, 2017 #45# is #50%# of #90#. Explanation: #45/90 = x/100#, where #x# is the percentage. #90x = 4500 => x = 50#. Equations of the form #a/b = c/d# can be transformed to #ad = bc#. In general, for any #a, b# with #b!=0#, from the equation #a/b = x/100#, #x# shows you what percentage #a# is, of #b#. Answer link Related questions Jimmy made a #"75%# on a test worth #46# points. How many points did he get correct? How do you use proportions to solve percent equations? How do you translate percent problems into an equation? What number is 32% of 600? What number is #3/4#% of 16? 8 is 20% of what number? 99 is 180% of what number? What percent of 7.2 is 45? What percent of 150 is 5? What is 2% of 92? See all questions in Percent Equations Impact of this question 17449 views around the world You can reuse this answer Creative Commons License