Finding the Fourth Proportional to 138.44, 190.99 and 80.19
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Solution
The fourth proportional to 138.44, 190.99 and 80.19 is: 110.63
Step by Step Solution
- Step 1: Write the proportion equation
138.44 : 190.99 = 80.19 : x - Step 2: Convert to fraction form
138.44/190.99 = 80.19/x - Step 3: Cross multiply
138.44x = 190.99 × 80.19 - Step 4: Simplify right side
138.44x = 15,315.09 - Step 5: Solve for x
x = 15,315.09/138.44 - Step 6: Final answer
x = 110.63
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.