Finding the Fourth Proportional to 311.18, 428.97 and 258.08
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Solution
The fourth proportional to 311.18, 428.97 and 258.08 is: 355.77
Step by Step Solution
- Step 1: Write the proportion equation
311.18 : 428.97 = 258.08 : x - Step 2: Convert to fraction form
311.18/428.97 = 258.08/x - Step 3: Cross multiply
311.18x = 428.97 × 258.08 - Step 4: Simplify right side
311.18x = 110,708.58 - Step 5: Solve for x
x = 110,708.58/311.18 - Step 6: Final answer
x = 355.77
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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.