Finding the Fourth Proportional to 213.70, 320.55 and 207.70
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Solution
The fourth proportional to 213.70, 320.55 and 207.70 is: 311.55
Step by Step Solution
- Step 1: Write the proportion equation
213.70 : 320.55 = 207.70 : x - Step 2: Convert to fraction form
213.70/320.55 = 207.70/x - Step 3: Cross multiply
213.70x = 320.55 × 207.70 - Step 4: Simplify right side
213.70x = 66,578.24 - Step 5: Solve for x
x = 66,578.24/213.70 - Step 6: Final answer
x = 311.55
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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.