• Pre algebra
  • Percents, Ratios and Propotions
  • Write proportions

Write proportions

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  • Question 1:
    1 pts
    Solve the proportion. $$\dfrac{3}{4}=\dfrac{x}{8}$$

    $x=4$

    $x=6$

    $x=8$

    $x=12$

  • Question 2:
    1 pts
    You can buy four T-shirts for $\$24.$ Write a proportion that gives the cost $c$ of buying seven T-shirts.
    $4:7=c:24$
    $7:4=24:c$
    $4:7=24:c$
    $4:c=24:7$
  • Question 3:
    1 pts
    The ratio of red marbles to green marbles is $7:5.$ There are $21$ red marbles. The given proportion can be used to find the number $x$ of green marbles are there?$$\dfrac{7}{5}=\dfrac{x}{21}$$
  • Question 4:
    1 pts
    If eight trash bags last for thirty days, which of the proportions can be used to find how many days will last for twenty-eight trash bags?
    $\dfrac{8}{30}=\dfrac{x}{28}$
    $\dfrac{8}{28}=\dfrac{30}{x}$
    $\dfrac{30}{8}=\dfrac{28}{x}$
    $\dfrac{8}{x}=\dfrac{28}{30}$
  • Question 5:
    2 pts
    If a $5$ foot person casts a $3.2$ foot shadow, which of the proportions can be used to find how tall is a person who casts a $4.8$ foot shadow?

    $5:4.8=3.2:x$

    $5:x=4.8:3.2$

    $x:5=3.2:4.8$

    $5:x=3.2:4.8$

  • Question 6:
    2 pts
    The property tax rate in a certain state is $\$1.25$ for every $\$250$ in property value. If a home has a property value of $\$85 000$, which of the proportions can be used to find how much will be the property tax?
    $\$1.25:\$250=\$x:\$85000$
    $\$1.25:\$250=\$85000:\$x$
    $\$250:\$1.25=\$x:\$85000$
    $\$250:\$85000=\$x:\$1.25$
  • Question 7:
    2 pts
    Carol can type 520 words in 13 minutes. Which of the proportions can be used to find how many words can she type in 40 minutes?
  • Question 8:
    2 pts
    The recipe for strawberry jam says $1.5\mbox{kg}$ of sugar for $2\mbox{kg}$ of strawberries. I have $5.5\mbox{kg}$ of strawberries. Which of the proportions can be used to find how much sugar do I need?
    $1.5:x=5.5:2$
    $2:1.5=x:5.5$
    $1.5:2=x:5.5$
    $1.5:2=5.5:x$
  • Question 9:
    3 pts
    Which of the proportions can be used to find how many points a student needs to have on the test if test worth 50 points to gets the score of $74\%.$

    $50:100\%=x:74\%$

    $x:100\%=50:74\%$

    $100\%:50=x:74\%$

    $50:100\%=74\%:x$

  • Question 10:
    3 pts
    Which of the proportions can be used to find what number must be added to both numerator and denominator of the fraction $\dfrac{7}{19}$ to make the resulting fraction of $\dfrac{3}{4}.$
    $\dfrac{7}{19}=\dfrac{3}{4}+x$
    $\dfrac{7}{19}+x=\dfrac{3}{4}$
    $\dfrac{7+x}{19+x}=\dfrac{3}{4}$
    none of the above
  • Question 11:
    3 pts
    A map uses a scale $\dfrac{1}{4} \mbox{inches}=30 \mbox{miles}$. On a map, two cities are $2\dfrac{7}{8} \mbox{inches}$ inches apart. Which of the proportions can be used to find how many miles apart are the two cities?
  • Question 12:
    3 pts
    There are some books on the shelf and $15$ are cookbooks. If $30\%$ are cookbooks, which of the proportions can be used to find how many books are on the shelf?
    $\dfrac{10}{3}=\dfrac{15}{?}$
    $\dfrac{3}{10}=\dfrac{15}{?}$
    $\dfrac{15}{10}=\dfrac{3}{?}$
    $\dfrac{3}{10}=\dfrac{?}{15}$