Finding the Fourth Proportional to 79.12, 117.96 and 77.68
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Solution
The fourth proportional to 79.12, 117.96 and 77.68 is: 115.81
Step by Step Solution
- Step 1: Write the proportion equation
79.12 : 117.96 = 77.68 : x - Step 2: Convert to fraction form
79.12/117.96 = 77.68/x - Step 3: Cross multiply
79.12x = 117.96 × 77.68 - Step 4: Simplify right side
79.12x = 9,163.13 - Step 5: Solve for x
x = 9,163.13/79.12 - Step 6: Final answer
x = 115.81
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.