Finding the Fourth Proportional to 84.21, 115.97 and 73.14
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Solution
The fourth proportional to 84.21, 115.97 and 73.14 is: 100.72
Step by Step Solution
- Step 1: Write the proportion equation
84.21 : 115.97 = 73.14 : x - Step 2: Convert to fraction form
84.21/115.97 = 73.14/x - Step 3: Cross multiply
84.21x = 115.97 × 73.14 - Step 4: Simplify right side
84.21x = 8,481.68 - Step 5: Solve for x
x = 8,481.68/84.21 - Step 6: Final answer
x = 100.72
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.