Finding the Fourth Proportional to 216.68, 324.84 and 79.70
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Solution
The fourth proportional to 216.68, 324.84 and 79.70 is: 119.48
Step by Step Solution
- Step 1: Write the proportion equation
216.68 : 324.84 = 79.70 : x - Step 2: Convert to fraction form
216.68/324.84 = 79.70/x - Step 3: Cross multiply
216.68x = 324.84 × 79.70 - Step 4: Simplify right side
216.68x = 25,889.75 - Step 5: Solve for x
x = 25,889.75/216.68 - Step 6: Final answer
x = 119.48
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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.