Finding the Fourth Proportional to 81.44, 121.84 and 61.08
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Solution
The fourth proportional to 81.44, 121.84 and 61.08 is: 91.38
Step by Step Solution
- Step 1: Write the proportion equation
81.44 : 121.84 = 61.08 : x - Step 2: Convert to fraction form
81.44/121.84 = 61.08/x - Step 3: Cross multiply
81.44x = 121.84 × 61.08 - Step 4: Simplify right side
81.44x = 7,441.99 - Step 5: Solve for x
x = 7,441.99/81.44 - Step 6: Final answer
x = 91.38
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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.