Finding the Fourth Proportional to 128.26, 177 and 79.13
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Solution
The fourth proportional to 128.26, 177 and 79.13 is: 109.20
Step by Step Solution
- Step 1: Write the proportion equation
128.26 : 177 = 79.13 : x - Step 2: Convert to fraction form
128.26/177 = 79.13/x - Step 3: Cross multiply
128.26x = 177 × 79.13 - Step 4: Simplify right side
128.26x = 14,005.13 - Step 5: Solve for x
x = 14,005.13/128.26 - Step 6: Final answer
x = 109.20
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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.