Finding the Fourth Proportional to 115.28, 172.92 and 84.99
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Solution
The fourth proportional to 115.28, 172.92 and 84.99 is: 127.49
Step by Step Solution
- Step 1: Write the proportion equation
115.28 : 172.92 = 84.99 : x - Step 2: Convert to fraction form
115.28/172.92 = 84.99/x - Step 3: Cross multiply
115.28x = 172.92 × 84.99 - Step 4: Simplify right side
115.28x = 14,696.69 - Step 5: Solve for x
x = 14,696.69/115.28 - Step 6: Final answer
x = 127.49
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.