- Aa and d
- Bb and c
- Ca and b
- Dc and d
Step-by-Step Solution
In a : b :: c : d, the first and last terms (a and d) are the extremes, while the middle terms (b and c) are the means.
Answer: A) a and d
In a proportion a : b :: c : d, which pair are the 'extremes'?
Class 6Ratio and ProportionRatio and Proportion
Key idea: Proportion: when two ratios are equal
If a : , the four numbers are in proportion. The classic check: the **product of the extremes** equals the **product of the means** . Example: are 4 : 6 and 6 : 9 in proportion? Cross-multiply: . Equal → yes, in proportion.
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