Finding the Fourth Proportional to 311.12, 428.21 and 248.75
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Solution
The fourth proportional to 311.12, 428.21 and 248.75 is: 342.37
Step by Step Solution
- Step 1: Write the proportion equation
311.12 : 428.21 = 248.75 : x - Step 2: Convert to fraction form
311.12/428.21 = 248.75/x - Step 3: Cross multiply
311.12x = 428.21 × 248.75 - Step 4: Simplify right side
311.12x = 106,517.24 - Step 5: Solve for x
x = 106,517.24/311.12 - Step 6: Final answer
x = 342.37
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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.