Finding the Fourth Proportional to 81.24, 121.26 and 74.84
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Solution
The fourth proportional to 81.24, 121.26 and 74.84 is: 111.70
Step by Step Solution
- Step 1: Write the proportion equation
81.24 : 121.26 = 74.84 : x - Step 2: Convert to fraction form
81.24/121.26 = 74.84/x - Step 3: Cross multiply
81.24x = 121.26 × 74.84 - Step 4: Simplify right side
81.24x = 9,074.49 - Step 5: Solve for x
x = 9,074.49/81.24 - Step 6: Final answer
x = 111.70
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.