Finding the Fourth Proportional to 129.26, 193.62 and 74.90
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Solution
The fourth proportional to 129.26, 193.62 and 74.90 is: 112.19
Step by Step Solution
- Step 1: Write the proportion equation
129.26 : 193.62 = 74.90 : x - Step 2: Convert to fraction form
129.26/193.62 = 74.90/x - Step 3: Cross multiply
129.26x = 193.62 × 74.90 - Step 4: Simplify right side
129.26x = 14,502.14 - Step 5: Solve for x
x = 14,502.14/129.26 - Step 6: Final answer
x = 112.19
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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.