What is 17.18428428428... as a Fraction?

17.18428 equals 1716719990 as a fraction.

How do you turn 17.18428 repeating into a fraction?

Detailed Answer:

Step 1: To convert 17.18428 repeating into a fraction, begin writing this simple equation:

n = 17.18428 (equation 1)

Step 2: Notice that there are 3 digits in the repeating block (428) and 2 digits in the non-repeating part (18). Multiply both sides by 10⁵ = 100000.

100000 × n = 1718428.428 (equation 2)

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

100000 × n = 1718428.428
   100 × n = 17.18428
 99900 × n = 1716710

171671099900 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 10 (the GCF - greatest common factor).

n = 171671099900 = 1716710 ÷ 1099900 ÷ 10 = 1716719990. So,

17.18428 = 1716719990 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 1716719990 is also equal to 1718419990 when expressed as a mixed number.

The repeating decimal 17.18428 (vinculum notation) has a repeated block length of 3. It is also represented as 17.18428428428... (ellipsis notation) which equals approximately 17.18428428428428428 (decimal approximation)(*).

The recurring decimal 17.18428 can be written as a ratio of two integers having 171671 as the numerator and 9990 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.