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# Basic Math/what's the dots about?

Question
9:x::5:300 value of x

Hello, Sue.

The dots indicate that you have a ratio. 9:x = 5:300 or 9/x = 5/300.

To solve this, first cross-multiply. This gives you 5x = 2700. Next, divide both sides by 5, giving you an answer of x = 540.

I hope this helps.

Regards,
John
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment thank you. was very helpful.

Basic Math

Volunteer

#### John Zalewski

##### Expertise

I can help you solve problems involving fractions, decimals, ratios, and algebra. I can teach you how to do math faster, and even in your head. I can teach math definitions, and help you study, if necessary. Please do not ask any graphing, trigonometry, or calculus questions. Try to work through homework questions before asking for assistance.

##### Experience

I routinely process numbers of all kinds in my head, without need of a calculator.

Education/Credentials
I was an A math student while in high school.