Finding the Fourth Proportional to 84.81, 126.99 and 72.70
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Solution
The fourth proportional to 84.81, 126.99 and 72.70 is: 108.85
Step by Step Solution
- Step 1: Write the proportion equation
84.81 : 126.99 = 72.70 : x - Step 2: Convert to fraction form
84.81/126.99 = 72.70/x - Step 3: Cross multiply
84.81x = 126.99 × 72.70 - Step 4: Simplify right side
84.81x = 9,231.33 - Step 5: Solve for x
x = 9,231.33/84.81 - Step 6: Final answer
x = 108.85
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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.