Ratio Calculations

The Ratio Mode lets you determine the value of X in the ratio expression A : B = X : D (or A : B = C : X) when the values of A, B, C and D are known. The following shows the general procedure for using Ratio.

1. Press , select the Ratio Mode icon, and then press .

2. On the menu that appears, select (A:B=X:D) or (A:B=C:X).

3. On the Coefficient Editor screen that appears, input up to 10 digits for each of the required values (A, B, C, D).

To solve 3 : 8 = X : 12 for X, for example, press in step 1, and then input the following for the coefficients (A = 3, B = 8, D = 12): 3812.

Pressing will reset all of the coefficients to one.

4. After all the values are the way you want, press .

This displays the solution (value of X).

Pressing again will return to the Coefficient Editor.

Important!

A Math ERROR will occur if you perform a calculation while 0 is input for a coefficient.

Changing the Ratio Expression Type

Press (Select Type) and then select the ratio expression type you want from the menu that appears. Changing the ratio expression type causes the values of all Coefficient Editor coefficients to change to one.