Finding the Fourth Proportional to 81.26, 122.44 and 72.98
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Solution
The fourth proportional to 81.26, 122.44 and 72.98 is: 109.96
Step by Step Solution
- Step 1: Write the proportion equation
81.26 : 122.44 = 72.98 : x - Step 2: Convert to fraction form
81.26/122.44 = 72.98/x - Step 3: Cross multiply
81.26x = 122.44 × 72.98 - Step 4: Simplify right side
81.26x = 8,935.67 - Step 5: Solve for x
x = 8,935.67/81.26 - Step 6: Final answer
x = 109.96
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Why These Related Problems?
These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.