About $$ \frac{39}{50} $$ of Earth's atmosphere is made up of nitrogen. Use equivalent ratios to find about what percent of the atmosphere is nitrogen.

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To find the percentage of Earth's atmosphere that is made up of nitrogen using equivalent ratios, we can set up a proportion based on the fraction given.

1. We know that $$ \frac{39}{50} $$ represents the part of the atmosphere that is nitrogen.
2. We want to express this fraction as a percentage, which is a ratio out of 100.

We can set up the following proportion:

$$
\frac{39}{50} = \frac{x}{100}
$$

where $$ x $$ is the percentage of nitrogen in the atmosphere.

3. To solve for $$ x $$, we can cross-multiply:

$$
39 \cdot 100 = 50 \cdot x
$$

4. This simplifies to:

$$
3900 = 50x
$$

5. Now, divide both sides by 50 to isolate $$ x $$:

$$
x = \frac{3900}{50}
$$

Now, let's calculate $$ x $$.
Calculate the value by following steps:
- step0: Calculate:
  $$\frac{3900}{50}$$
- step1: Reduce the numbers:
  $$\frac{78}{1}$$
- step2: Calculate:
  $$78$$
Calculating $$ x $$ gives us:

$$
x = \frac{3900}{50} = 78
$$

Thus, about $$ 78\% $$ of Earth's atmosphere is made up of nitrogen.
About 78% of Earth's atmosphere is made up of nitrogen.

About \( \frac{39}{50} \) of Earth's atmosphere is made up of nitrogen. Use equivalent ratios to find about what percent of the atmosphere is nitrogen.

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