To solve: The proportion 718=x5 for the given variable x and round to the nearest tenth.

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vazelinahS

2021-08-09

To solve: The proportion

\frac{7}{18} = \frac{x}{5}

for the given variable x and round to the nearest tenth.

Nola Robson

Skilled2021-08-10Added 94 answers

Approach:
If two ratios are equal then it is a proportion. If

\frac{p}{q}

and

\frac{r}{s}

are two ratios, then

\frac{p}{q} = \frac{r}{s}

is a proportion.
Ex:

\frac{3}{4} = \frac{15}{20}

For finding unknown numbers in proportions, we use cross product to find the unknown number.
Ex:

\frac{2}{7} = \frac{x}{14}

Here in the example x is the unknown number. To calculate the value of x, we use the cross product.
Calculation:
Given

\frac{7}{18} = \frac{x}{5}

Apply the cross product in order to find the unknown number.

7 \times 5 = 18 \times x

35 = 18 x

Divide both the sides by 18

\frac{35}{18} = \frac{18 x}{18}

1.9444 = x

Round to the nearest tenth

x = 1.9

Final statement: The solution for the proportion

\frac{7}{18} = \frac{x}{5}

for the indicated variable is

x = 1.9

Jeffrey Jordon

Expert2021-12-17Added 2605 answers

Answer is given below (on video)

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