Finding the Fourth Proportional to 111.42, 153.82 and 74.62
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Solution
The fourth proportional to 111.42, 153.82 and 74.62 is: 103.02
Step by Step Solution
- Step 1: Write the proportion equation
111.42 : 153.82 = 74.62 : x - Step 2: Convert to fraction form
111.42/153.82 = 74.62/x - Step 3: Cross multiply
111.42x = 153.82 × 74.62 - Step 4: Simplify right side
111.42x = 11,478.05 - Step 5: Solve for x
x = 11,478.05/111.42 - Step 6: Final answer
x = 103.02
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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.