Finding the Fourth Proportional to 207.91, 311.90 and 84.55
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Solution
The fourth proportional to 207.91, 311.90 and 84.55 is: 126.83
Step by Step Solution
- Step 1: Write the proportion equation
207.91 : 311.90 = 84.55 : x - Step 2: Convert to fraction form
207.91/311.90 = 84.55/x - Step 3: Cross multiply
207.91x = 311.90 × 84.55 - Step 4: Simplify right side
207.91x = 26,370.26 - Step 5: Solve for x
x = 26,370.26/207.91 - Step 6: Final answer
x = 126.83
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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.