Finding the Fourth Proportional to 128.25, 177.09 and 84.68
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Solution
The fourth proportional to 128.25, 177.09 and 84.68 is: 116.92
Step by Step Solution
- Step 1: Write the proportion equation
128.25 : 177.09 = 84.68 : x - Step 2: Convert to fraction form
128.25/177.09 = 84.68/x - Step 3: Cross multiply
128.25x = 177.09 × 84.68 - Step 4: Simplify right side
128.25x = 14,995.44 - Step 5: Solve for x
x = 14,995.44/128.25 - Step 6: Final answer
x = 116.92
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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.