Question

the equatorial circumference of Earth is 4.01 * 10^4 kilometers. One kilometer is equivalent to 3.94 x 10^4 inches. What is the Equatorial circumference of Earth in inches?​

Answer 1

Answer: $1,579,940,000\ inches$

Step-by-step explanation:

Let be "x" the  Equatorial circumference of Earth in inches.

Based on the data given in the exercise, you know that the equatorial circumference of Earth is $4.01 * 10^4\ kilometers$.

You also know that:

$1\ kilometer=3.94* 10^4\ inches.$

 Then, you can set up the following proportion:

$\frac{3.94*10^4\ inches}{1\ kilometer}=\frac{x}{4.01 * 10^4\ kilometers}$

Finally, you must solve for "x" in order to find its value.

Applying this procedure you get the following result:

$(4.01 * 10^4\ kilometers)(\frac{3.94*10^4\ inches}{1\ kilometer})=x\\\\x=1,579,940,000\ inches$