Finding the Fourth Proportional to 128.74, 192.84 and 82.99
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Solution
The fourth proportional to 128.74, 192.84 and 82.99 is: 124.31
Step by Step Solution
- Step 1: Write the proportion equation
128.74 : 192.84 = 82.99 : x - Step 2: Convert to fraction form
128.74/192.84 = 82.99/x - Step 3: Cross multiply
128.74x = 192.84 × 82.99 - Step 4: Simplify right side
128.74x = 16,003.79 - Step 5: Solve for x
x = 16,003.79/128.74 - Step 6: Final answer
x = 124.31
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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.