Finding the Fourth Proportional to 81.53, 122.39 and 74.44
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Solution
The fourth proportional to 81.53, 122.39 and 74.44 is: 111.75
Step by Step Solution
- Step 1: Write the proportion equation
81.53 : 122.39 = 74.44 : x - Step 2: Convert to fraction form
81.53/122.39 = 74.44/x - Step 3: Cross multiply
81.53x = 122.39 × 74.44 - Step 4: Simplify right side
81.53x = 9,110.71 - Step 5: Solve for x
x = 9,110.71/81.53 - Step 6: Final answer
x = 111.75
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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.