Rate
Measurement of the number of times sth happens or exists during a particular period
通常表示各种比率；率：
discount rate 贴现率；折扣率
rate of unemployment 失业率
crime/divorce rate 犯罪╱离婚率
success/failure rate 成功╱失败率
exchange/interest rates 汇率；利率
rates of exchange/interest 汇率；利率
Ratio
The relationship between two groups of people or things that is represented by two numbers showing how much larger one group is than the other
强调两部分的比率；比例。一般用介词to连接比较的两部分
ratio of men to women 男女比例
teacher-student ratio 师生比例
The ratio of applications to available places currently stands at 100:1.
目前，申请人数和就业岗位的比例为100:1。
Proportion
The proportion of one kind of person or thing in a group is the number of people or things of that kind compared to the total number of people or things in the group.
强调(某部分在总体中所占的)比例
The proportion of women in the profession had risen to 17.3%.
从事那个职业的女性比例已经增长到17.3%。
参考双语例句：
This assessment involves judgment as to: (i) the likely future commerciality of the asset and when such commerciality should be determined; (ii) future revenues based on forecasted oil and gas prices; (iii) future development costs and production expenses; (iv) the discount rate to be applied to such revenues and costs for the purpose of deriving a recoverable value, and (v) potential value to future E&E activities of any geological and geographical data acquired.
此评估涉及以下判断：(i)资产日后在商业上可行的可能性及断定其商业上可行的时间；(ii)根据预测石油及天然气价格计算的日后收益；(iii)日后开发成本及生产开支；(iv)就计算可收回价值时将应用于有关收益及成本的折现率；及(v)所获得的任何地质及地理数据对日后勘探及评估活动的潜在价值。
While it is generally true that the ratio of staff to managers in knowledge work is smaller than in other types of work environments, UNESCO’s ratio seems quite low and costly, even taking into account the fact that many of those in managerial positions devote considerable time to substantive work.
虽然总的来说在知识型工作中，工作人员与管理人员的比例低于其他种类的工作，但是教科文组织的比例还是相当低，成本也很高，即使考虑到很多担任管理层职务的人也投入了相当多的时间从事具体工作这一事实也是如此。
In this connection, the Bills Committee urged the authorities to consider a number of proposals relating to the provision of a rent-to-income ratio (RIR) cap or a rent increase cap, which include imposing a statutory RIR cap at individual household level; setting a rent level cap with reference to weighted average ratios of rent and income in each household size group; reducing the 20% RIR cap under the RAS to 15% RIR and improving the RAS, as well as introducing a MRIR cap in respect of increase in PRH rents in each rent review.
就此，法案委员会曾促请当局考虑多项订定租金与入息比例上限或加租上限的建议，包括在个别住户层面实施法定的租金与入息比例上限规定；参考每个家庭人数组别的租金与入息比例的加权平均数订定租金水平上限；把租援计划所订的租金与入息比例20%上限调低至15%，并改善租援计划，以及为每次租金检讨订定某个百分比的加租上限等。
While the proportion of financial and human resources decentralized to Africa within the framework of the regular programme has increased and is now the highest among regions, the capacities decentralized to Africa need to be further strengthened to achieve a significant impact.
虽然下放到非洲的财政资源和人力资源的比例在正常计划的框架内已增加，而且这一比例目前是各地区当中最高的，但下放到非洲的各种能力需要进一步提高，以产生显著的影响。
来源：译问