Finding the Fourth Proportional to 111.62, 153.61 and 87.05
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Solution
The fourth proportional to 111.62, 153.61 and 87.05 is: 119.80
Step by Step Solution
- Step 1: Write the proportion equation
111.62 : 153.61 = 87.05 : x - Step 2: Convert to fraction form
111.62/153.61 = 87.05/x - Step 3: Cross multiply
111.62x = 153.61 × 87.05 - Step 4: Simplify right side
111.62x = 13,371.75 - Step 5: Solve for x
x = 13,371.75/111.62 - Step 6: Final answer
x = 119.80
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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.