Finding the Fourth Proportional to 157.92, 217.92 and 87.99
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Solution
The fourth proportional to 157.92, 217.92 and 87.99 is: 121.41
Step by Step Solution
- Step 1: Write the proportion equation
157.92 : 217.92 = 87.99 : x - Step 2: Convert to fraction form
157.92/217.92 = 87.99/x - Step 3: Cross multiply
157.92x = 217.92 × 87.99 - Step 4: Simplify right side
157.92x = 19,173.55 - Step 5: Solve for x
x = 19,173.55/157.92 - Step 6: Final answer
x = 121.41
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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.