Likeness of proportion
Paired numbers illustrating equal ratios
A faint pencil heading reads "Simiglianza di proporzione" (Likeness of proportion), introducing paired numbers set out to show equal ratios. The values 3 and 6 stand beside 4 and 2, comparing how one pair relates as the other does. Most of the page below is left blank.
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Equal ratios: 3 : 6 and 4 : 2
Under the heading "Likeness of proportion," Leonardo pairs the numbers 3 with 6 and 4 with 2. The arrangement demonstrates proportion by juxtaposing ratios so their likeness can be read off directly, a companion to the definitions worked out on the preceding folios.