Finding the Fourth Proportional to 111.88, 154.31 and 74.99
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Solution
The fourth proportional to 111.88, 154.31 and 74.99 is: 103.43
Step by Step Solution
- Step 1: Write the proportion equation
111.88 : 154.31 = 74.99 : x - Step 2: Convert to fraction form
111.88/154.31 = 74.99/x - Step 3: Cross multiply
111.88x = 154.31 × 74.99 - Step 4: Simplify right side
111.88x = 11,571.72 - Step 5: Solve for x
x = 11,571.72/111.88 - Step 6: Final answer
x = 103.43
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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.