nicoleamberdrew nicoleamberdrew
  • 12-12-2018
  • Mathematics
contestada

Find the unknown value in the proportion: 9⁄x = 27⁄39
A. 6.2
B. 36
C. 38
D. 13

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 12-12-2018

Answer:

D. 13

Step-by-step explanation:

Multiply the given equation by 39x/27:

... x = 9·39/27 = 39/3

... x = 13

______

The usual approach

You may have learned to "cross multiply" to eliminate fractions. That means you multiply by the product of the denominators, 39x:

... 9·39 = 27x

Now, you divide by the coefficient of x, which is 27.

... 9/27 · 39 = x = 39/3 = 13 . . . . . . in the end, the same as above

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