LESSON 2

CONVERSION OF LINEAR

MEASUREMENTS FROM THE ENGLISH TO THE

METRIC SYSTEM AND FROM THE METRIC TO THE

ENGLISH SYSTEM; AND SOLVING PROBLEMS USING

RATIO, PROPORTION, AND TRIGONOMETRY

TASK 2.

Describe the

processes

for

solving

problems

using

ratio

and

proportion.

CONDITIONS

Within a self-study

environment

and

given

the

subcourse

text,

without

assistance.

STANDARDS

Within two hours

REFERENCES

No supplementary references are needed for this task.

1.

Introduction

A major part of machine shop work involves the fabrication of such parts as

a spool, gear, or pulley for machinery and vehicle powertrains. These type

parts must be machined to a predetermined size that will enable their

turning at a given number of revolutions per minute (rpm). The machining of

these parts requires knowledge of the mathematical processes involved in

determining the size to which these items must be machined.

This task,

therefore, is designed to provide the processes for determining the size of

these parts through the use of mathematical problems involving ratio and

proportion. Subsequent paragraphs provide an explanation of the methods for

solving ratio and proportion problems.