To convert pounds (lbs) to kilograms (kg), you can use the following step-by-step instructions:

Step 1: Understand the conversion factor

1 lb is equal to approximately 0.45359237 kg. This is the conversion factor we will use to convert pounds to kilograms.

Step 2: Set up the conversion equation

To convert 172 lbs to kg, we can set up the equation as follows:

172 lbs * (0.45359237 kg/1 lb)

Step 3: Cancel out the units

In the equation, the unit “lbs” is present in both the numerator and denominator. By multiplying the given weight by the conversion factor, the unit “lbs” will cancel out, leaving us with the desired unit “kg.”

Step 4: Perform the calculation

Now, let’s calculate the conversion:

172 lbs * (0.45359237 kg/1 lb) = 77.56482964 kg

Step 5: Round the answer (if necessary)

Since the conversion factor is given to several decimal places, it is common to round the final answer to a reasonable number of decimal places. In this case, we can round the answer to two decimal places:

77.56 kg

Therefore, 172 lbs is approximately equal to 77.56 kg.