Finding the Fourth Proportional to 129.88, 194.75 and 81.19
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Solution
The fourth proportional to 129.88, 194.75 and 81.19 is: 121.75
Step by Step Solution
- Step 1: Write the proportion equation
129.88 : 194.75 = 81.19 : x - Step 2: Convert to fraction form
129.88/194.75 = 81.19/x - Step 3: Cross multiply
129.88x = 194.75 × 81.19 - Step 4: Simplify right side
129.88x = 15,812.20 - Step 5: Solve for x
x = 15,812.20/129.88 - Step 6: Final answer
x = 121.75
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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.