Finding the Fourth Proportional to 81.26, 121.74 and 65.19
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Solution
The fourth proportional to 81.26, 121.74 and 65.19 is: 97.66
Step by Step Solution
- Step 1: Write the proportion equation
81.26 : 121.74 = 65.19 : x - Step 2: Convert to fraction form
81.26/121.74 = 65.19/x - Step 3: Cross multiply
81.26x = 121.74 × 65.19 - Step 4: Simplify right side
81.26x = 7,936.23 - Step 5: Solve for x
x = 7,936.23/81.26 - Step 6: Final answer
x = 97.66
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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.