To convert 15 cm to inches, you will need to use the conversion factor of 1 inch = 2.54 cm. This means that every 1 inch is equal to 2.54 cm. Using this conversion factor, we can determine the equivalent value of 15 cm in inches.

Step 1: Write down the given value in centimeters, which is 15 cm.

Step 2: Set up a proportion using the conversion factor. The setup will look like this: 1 inch/2.54 cm = x inch/15 cm.

Step 3: Cross-multiply and solve for x. This can be done by multiplying the numerator of one side with the denominator of the other side and vice versa. The equation will look like this: 1 inch * 15 cm = 2.54 cm * x inch.

Step 4: Simplify the equation. 1 inch * 15 cm is equal to 15 cm and 2.54 cm * x inch is equal to 2.54x inch. Therefore, the equation now looks like this: 15 cm = 2.54x inch.

Step 5: Solve for x by dividing both sides of the equation by 2.54. This will give us the value of x in inches. The equation now looks like this: x inch = 15 cm/2.54.

Step 6: Use a calculator to find the value of x. 15 cm/2.54 is equal to 5.90551181 inches. Round off the decimal to the nearest hundredth to get the final answer of 5.91 inches.

Therefore, 15 cm is equivalent to 5.91 inches. You can also check your answer by dividing 15 cm by 2.54, which should give you a value of approximately 5.91 inches. This shows that our conversion is correct.

In conclusion, to convert a length value from centimeters to inches, you will need to use the conversion factor of 1 inch = 2.54 cm. By setting up a proportion and solving for the unknown value using cross-multiplication, you can easily convert any given value in centimeters to its equivalent value in inches.