Finding the Fourth Proportional to 311.78, 428.82 and 274.82
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Solution
The fourth proportional to 311.78, 428.82 and 274.82 is: 377.99
Step by Step Solution
- Step 1: Write the proportion equation
311.78 : 428.82 = 274.82 : x - Step 2: Convert to fraction form
311.78/428.82 = 274.82/x - Step 3: Cross multiply
311.78x = 428.82 × 274.82 - Step 4: Simplify right side
311.78x = 117,848.31 - Step 5: Solve for x
x = 117,848.31/311.78 - Step 6: Final answer
x = 377.99
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.