Finding the Fourth Proportional to 211.18, 316.67 and 87.70
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Solution
The fourth proportional to 211.18, 316.67 and 87.70 is: 131.51
Step by Step Solution
- Step 1: Write the proportion equation
211.18 : 316.67 = 87.70 : x - Step 2: Convert to fraction form
211.18/316.67 = 87.70/x - Step 3: Cross multiply
211.18x = 316.67 × 87.70 - Step 4: Simplify right side
211.18x = 27,771.96 - Step 5: Solve for x
x = 27,771.96/211.18 - Step 6: Final answer
x = 131.51
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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.