How do you solve the proportional #9/r=3/10#? Algebra Linear Equations Equations with Ratios and Proportions 1 Answer Mr. Danger · EZ as pi Nov 11, 2016 Cross-multiply and solve. Explanation: #9/r=3/10# #rxx3=3r, and 9xx10=90# #3r=90# #r=30# Answer link Related questions What is the difference between proportions and ratios? What is the difference between ratios and rates? What are cross products? How do you write "12 meters to 4 floors" as a rate? How do you write and simplify "150 boys to 175 girls" as a ratio? How do you solve #\frac{6}{19} = \frac{x}{11}#? How do you solve #\frac{n+1}{11} = -2#? How do you solve #\frac{0.1}{1.01} = \frac{1.9}{x}#? How do you use proportions to solve how much money the restaurant made if it serves 250 people... How do you solve #x/4-7=13#? See all questions in Equations with Ratios and Proportions Impact of this question 2544 views around the world You can reuse this answer Creative Commons License