Finding the Fourth Proportional to 81.44, 121.96 and 57.00
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Solution
The fourth proportional to 81.44, 121.96 and 57.00 is: 85.37
Step by Step Solution
- Step 1: Write the proportion equation
81.44 : 121.96 = 57.00 : x - Step 2: Convert to fraction form
81.44/121.96 = 57.00/x - Step 3: Cross multiply
81.44x = 121.96 × 57.00 - Step 4: Simplify right side
81.44x = 6,952.25 - Step 5: Solve for x
x = 6,952.25/81.44 - Step 6: Final answer
x = 85.37
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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.