Finding the Fourth Proportional to 115.42, 173.12 and 69.78
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Solution
The fourth proportional to 115.42, 173.12 and 69.78 is: 104.66
Step by Step Solution
- Step 1: Write the proportion equation
115.42 : 173.12 = 69.78 : x - Step 2: Convert to fraction form
115.42/173.12 = 69.78/x - Step 3: Cross multiply
115.42x = 173.12 × 69.78 - Step 4: Simplify right side
115.42x = 12,080.31 - Step 5: Solve for x
x = 12,080.31/115.42 - Step 6: Final answer
x = 104.66
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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.