Finding the Fourth Proportional to 211.19, 316.77 and 81.18
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Solution
The fourth proportional to 211.19, 316.77 and 81.18 is: 121.77
Step by Step Solution
- Step 1: Write the proportion equation
211.19 : 316.77 = 81.18 : x - Step 2: Convert to fraction form
211.19/316.77 = 81.18/x - Step 3: Cross multiply
211.19x = 316.77 × 81.18 - Step 4: Simplify right side
211.19x = 25,715.08 - Step 5: Solve for x
x = 25,715.08/211.19 - Step 6: Final answer
x = 121.77
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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.