Finding the Fourth Proportional to 115.68, 159.60 and 87.99
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Solution
The fourth proportional to 115.68, 159.60 and 87.99 is: 121.39
Step by Step Solution
- Step 1: Write the proportion equation
115.68 : 159.60 = 87.99 : x - Step 2: Convert to fraction form
115.68/159.60 = 87.99/x - Step 3: Cross multiply
115.68x = 159.60 × 87.99 - Step 4: Simplify right side
115.68x = 14,042.19 - Step 5: Solve for x
x = 14,042.19/115.68 - Step 6: Final answer
x = 121.39
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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.