The points H, I, J and K all lie on the same line segment, in that order, such that the ratio of HI : IJ:JK is equal to 2 : 4: 1. If HK = 7, find IJ.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter10: Analytic Geometry
Section10.4: Analytic Proofs
Problem 19E: Use the analytic method to decide what type of triangle is formed when the midpoints of the sides of...
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**Problem Statement:**

The points \(H\), \(I\), \(J\), and \(K\) all lie on the same line segment, in that order, such that the ratio of \(HI : IJ : JK\) is equal to \(2 : 4 : 1\). If \(HK = 7\), find \(IJ\).

To determine the length of \(IJ\), you must consider the given ratio and the total length of the segment.

1. **Understand the Ratio:**
   - The ratio \(2 : 4 : 1\) means that if you divided \(HK\) into parts where each part corresponds to a unit of the ratio:
     - \(HI\) is 2 parts
     - \(IJ\) is 4 parts 
     - \(JK\) is 1 part

2. **Total Parts:**
   - Add the parts together from the ratio \(2 + 4 + 1 = 7\).

3. **Length of One Part:**
   - Since the total length \(HK\) is 7 units, each part of the ratio \(2 : 4 : 1\) corresponds to one unit of length.

4. **Finding \(IJ\):**
   - As \(IJ\) corresponds to 4 parts in the given ratio, and each part is 1 unit,
   - The length of \(IJ = 4 \times 1 = 4 \) units.

Thus, \(IJ\) is found to be 4 units.
Transcribed Image Text:**Problem Statement:** The points \(H\), \(I\), \(J\), and \(K\) all lie on the same line segment, in that order, such that the ratio of \(HI : IJ : JK\) is equal to \(2 : 4 : 1\). If \(HK = 7\), find \(IJ\). To determine the length of \(IJ\), you must consider the given ratio and the total length of the segment. 1. **Understand the Ratio:** - The ratio \(2 : 4 : 1\) means that if you divided \(HK\) into parts where each part corresponds to a unit of the ratio: - \(HI\) is 2 parts - \(IJ\) is 4 parts - \(JK\) is 1 part 2. **Total Parts:** - Add the parts together from the ratio \(2 + 4 + 1 = 7\). 3. **Length of One Part:** - Since the total length \(HK\) is 7 units, each part of the ratio \(2 : 4 : 1\) corresponds to one unit of length. 4. **Finding \(IJ\):** - As \(IJ\) corresponds to 4 parts in the given ratio, and each part is 1 unit, - The length of \(IJ = 4 \times 1 = 4 \) units. Thus, \(IJ\) is found to be 4 units.
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