Finding the Fourth Proportional to 128.91, 177.82 and 91.99
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Solution
The fourth proportional to 128.91, 177.82 and 91.99 is: 126.89
Step by Step Solution
- Step 1: Write the proportion equation
128.91 : 177.82 = 91.99 : x - Step 2: Convert to fraction form
128.91/177.82 = 91.99/x - Step 3: Cross multiply
128.91x = 177.82 × 91.99 - Step 4: Simplify right side
128.91x = 16,357.66 - Step 5: Solve for x
x = 16,357.66/128.91 - Step 6: Final answer
x = 126.89
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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.