Finding the Fourth Proportional to 154.12, 231.09 and 76.99
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Solution
The fourth proportional to 154.12, 231.09 and 76.99 is: 115.44
Step by Step Solution
- Step 1: Write the proportion equation
154.12 : 231.09 = 76.99 : x - Step 2: Convert to fraction form
154.12/231.09 = 76.99/x - Step 3: Cross multiply
154.12x = 231.09 × 76.99 - Step 4: Simplify right side
154.12x = 17,791.62 - Step 5: Solve for x
x = 17,791.62/154.12 - Step 6: Final answer
x = 115.44
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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.