Ratio and Proportion (Leaving Cert Mathematics): Flashcards

A comparison of one quantity to another showing the relationship between them

Divide each term by HCF

Simplest form using smallest whole numbers

Yes, order corresponds to quantities mentioned

Multiply each term by same number (LCM)

Multiply both by 6 (LCM) = $2:5$

Relative sizes of parts, not actual amounts

Compares a part to the total amount

Ratio: part to part; Proportion: part to whole

Quantities increase/decrease at same rate; if one doubles, other doubles

$\frac{x_1}{y_1} = \frac{x_2}{y_2}$

Find value of one part first, then multiply