Finding the Fourth Proportional to 84.96, 117.09 and 66.60
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Solution
The fourth proportional to 84.96, 117.09 and 66.60 is: 91.79
Step by Step Solution
- Step 1: Write the proportion equation
84.96 : 117.09 = 66.60 : x - Step 2: Convert to fraction form
84.96/117.09 = 66.60/x - Step 3: Cross multiply
84.96x = 117.09 × 66.60 - Step 4: Simplify right side
84.96x = 7,798.19 - Step 5: Solve for x
x = 7,798.19/84.96 - Step 6: Final answer
x = 91.79
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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.