Finding the Fourth Proportional to 121.20, 181.44 and 84.96
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Solution
The fourth proportional to 121.20, 181.44 and 84.96 is: 127.19
Step by Step Solution
- Step 1: Write the proportion equation
121.20 : 181.44 = 84.96 : x - Step 2: Convert to fraction form
121.20/181.44 = 84.96/x - Step 3: Cross multiply
121.20x = 181.44 × 84.96 - Step 4: Simplify right side
121.20x = 15,415.14 - Step 5: Solve for x
x = 15,415.14/121.20 - Step 6: Final answer
x = 127.19
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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.