How to Say "proportion" in Spanish
The most common Spanish word for “proportion” is “porcentaje” — use 'porcentaje' when you are referring to a specific fraction or amount of a total, often expressed as a number out of 100.
porcentaje
por-sen-TA-hepoɾθenˈtaxe

Examples
Un gran porcentaje de los estudiantes vive cerca de la escuela.
A large percentage of the students live near the school.
El porcentaje de batería de mi teléfono es muy bajo.
My phone's battery percentage is very low.
Estamos tratando de aumentar el porcentaje de ventas este mes.
We are trying to increase the sales percentage this month.
Always Use 'De'
When you want to say 'percentage OF' something, you must always follow 'porcentaje' with the word 'de'. For example: 'porcentaje de éxito' (percentage of success).
Gender and Articles
This word is always masculine. You should always use 'el' or 'un' with it, even if the group you are describing is feminine.
Porcentaje vs. Por Ciento
Mistake: “El diez porcentaje de la gente...”
Correction: El diez por ciento de la gente...
proporción
Examples
La proporción de agua y arroz es de dos a uno.
The proportion of water and rice is two to one.
medida
meh-DEE-dahmeˈðiða

Examples
El éxito fue en gran medida gracias a tu esfuerzo.
The success was largely (to a great extent) thanks to your effort.
Quiero un vestido hecho a la medida.
I want a custom-made (tailored to fit) dress.
En la medida de lo posible, evita los gastos innecesarios.
As far as possible (to the extent possible), avoid unnecessary expenses.
Fixed Phrases
'Medida' is often used in fixed phrases like 'a la medida' (custom-made) or 'en gran medida' (largely) that function almost like adverbs or adjectives.
Confusing 'A la medida'
Mistake: “Using 'por la medida' when you mean 'custom-made'.”
Correction: The correct preposition is 'a': 'un traje hecho a la medida' (a suit made to fit).
razón
Examples
El interés se calcula a razón del cinco por ciento anual.
The interest is calculated at a rate of five percent per year.
Proporción vs. Porcentaje
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