Finding the Fourth Proportional to 121.13, 181.60 and 77.84
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Solution
The fourth proportional to 121.13, 181.60 and 77.84 is: 116.70
Step by Step Solution
- Step 1: Write the proportion equation
121.13 : 181.60 = 77.84 : x - Step 2: Convert to fraction form
121.13/181.60 = 77.84/x - Step 3: Cross multiply
121.13x = 181.60 × 77.84 - Step 4: Simplify right side
121.13x = 14,135.55 - Step 5: Solve for x
x = 14,135.55/121.13 - Step 6: Final answer
x = 116.70
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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.