Finding the Fourth Proportional to 84.06, 115.74 and 76.68
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Solution
The fourth proportional to 84.06, 115.74 and 76.68 is: 105.58
Step by Step Solution
- Step 1: Write the proportion equation
84.06 : 115.74 = 76.68 : x - Step 2: Convert to fraction form
84.06/115.74 = 76.68/x - Step 3: Cross multiply
84.06x = 115.74 × 76.68 - Step 4: Simplify right side
84.06x = 8,874.94 - Step 5: Solve for x
x = 8,874.94/84.06 - Step 6: Final answer
x = 105.58
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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.