Finding the Fourth Proportional to 121.56, 181.99 and 80.99
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Solution
The fourth proportional to 121.56, 181.99 and 80.99 is: 121.25
Step by Step Solution
- Step 1: Write the proportion equation
121.56 : 181.99 = 80.99 : x - Step 2: Convert to fraction form
121.56/181.99 = 80.99/x - Step 3: Cross multiply
121.56x = 181.99 × 80.99 - Step 4: Simplify right side
121.56x = 14,739.37 - Step 5: Solve for x
x = 14,739.37/121.56 - Step 6: Final answer
x = 121.25
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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.