What is 172.13777... as a Fraction?

172.137 equals 38731225 as a fraction.

How do you turn 172.137 repeating into a fraction?

Detailed Answer:

Step 1: To convert 172.137 repeating into a fraction, begin writing this simple equation:

n = 172.137 (equation 1)

Step 2: Notice that there is 1 digit in the repeating block (7) and 2 digits in the non-repeating part (13). Multiply both sides by 10³ = 1000.

1000 × n = 172137.7 (equation 2)

Step 3: Now subtract equation 1 from equation 2 to cancel the repeating block (or repetend) out.

1000 × n = 172137.7
 100 × n = 172.137
 900 × n = 154924

154924900 could be the answer, but it still can be put in the simplest form, i.e., reduced.

To simplify this fraction, divide the numerator and denominator by 4 (the GCF - greatest common factor).

n = 154924900 = 154924 ÷ 4900 ÷ 4 = 38731225. So,

172.137 = 38731225 as the lowest possible fraction.

As the numerator is greater than the denominator, we have an improper fraction, so we can also express it as a mixed number, thus 38731225 is also equal to 17231225 when expressed as a mixed number.

The repeating decimal 172.137 (vinculum notation) has a repeated block length of 1. It is also represented as 172.13777... (ellipsis notation) which equals approximately 172.1377777 (decimal approximation)(*).

The recurring decimal 172.137 can be written as a ratio of two integers having 38731 as the numerator and 225 as the denominator. So, it is a rational number (named after ratio). It can be shown that a number is rational if its decimal representation is repeating or terminating.

(*) At present, there is no single universally accepted notation or phrasing for repeating decimals.