400
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A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. Assuming that the number 400 is in base 10 then it is a decimal equivalent. If it is in any base other than 10 then it is not a decimal.
400
A meter is approximately 3.2808399 feet, so you divide your number of feet (400) by 3.2808399 to find out how many meters it is equivalent to. This equals 121.92, and so therefore 400 ft is equivalent to 121.92 meters.
There are an infinite number of equivalent fractions for three fourths. Some of them are six eights, 12/16, and 300/400.
400 is a significant number because it is a square number as 20*20 = 400