HP 300s Scientific Calculator - Manual (Page 82)

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Proportion Calculations (PROP)
Use the key to enter the PROP mode when you want to solve
a ratio expression.
In PROP mode, you can solve the value of X in the ratio
expression.
Inputting and Editing Coefficients
• The PROP 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.
• Use the coefficient editor screen to input the coefficients of
a ratio expression. The coefficient editor screen shows
input cells for each of the coefficients required by the
currently selected ratio expression type.
• Rules for inputting and editing coefficients
- Data you input is inserted into the cell where the cursor
is located. When you register input into a cell, the
cursor moves to the next cell to the right.
- The values and expressions you can input on the
coefficient editor screen are the same as those you can
input in the COMP mode with linear format.
- Press  while inputting data clears your current input.
- After inputting data, press  . This registers the value
and displays up to six of its digits in the currently
selected cell.
- To change the contents of a cell, use the cursor keys to
move the cursor to the cell and then input the new data.
• You can clear all coefficients to zero by pressing the 
key while inputting values on the coefficient editor screen.
a/b = x/d a/b = c/x
Key in Display Display



or
