Ratio Calculations - Casio fx-991ZA PLUS II User Manual

• "No-Solution" appears on the solution screen when no solution exists for
an inequality (such as X

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
2. On the menu that appears, select
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
then input the following for the coefficients (a = 3, b = 8, d = 12): 3
12 .
• To change a coefficient value you already have input, move the cursor
to the appropriate cell, input the new value, and then press
• Pressing will clear all of the coefficients to zero.
Note: The following operations are not supported by the Coefficient
Editor: ,
statements also cannot be input with the Coefficient Editor.
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.
2
< 0).
(RATIO) to enter the RATIO Mode.
(a:b=X:d) or
(M-), (STO). Pol, Rec, ÷R, and multi-
81
(a:b=c:X).
in step 1, and
8
.
.