Finding the Fourth Proportional to 81.84, 122.14 and 79.28
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Solution
The fourth proportional to 81.84, 122.14 and 79.28 is: 118.32
Step by Step Solution
- Step 1: Write the proportion equation
81.84 : 122.14 = 79.28 : x - Step 2: Convert to fraction form
81.84/122.14 = 79.28/x - Step 3: Cross multiply
81.84x = 122.14 × 79.28 - Step 4: Simplify right side
81.84x = 9,683.26 - Step 5: Solve for x
x = 9,683.26/81.84 - Step 6: Final answer
x = 118.32
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.