Finding the Fourth Proportional to 261.28, 391.79 and 122.44
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Solution
The fourth proportional to 261.28, 391.79 and 122.44 is: 183.59
Step by Step Solution
- Step 1: Write the proportion equation
261.28 : 391.79 = 122.44 : x - Step 2: Convert to fraction form
261.28/391.79 = 122.44/x - Step 3: Cross multiply
261.28x = 391.79 × 122.44 - Step 4: Simplify right side
261.28x = 47,968.20 - Step 5: Solve for x
x = 47,968.20/261.28 - Step 6: Final answer
x = 183.59
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.