Finding the Fourth Proportional to 84.20, 126.16 and 68.99
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Solution
The fourth proportional to 84.20, 126.16 and 68.99 is: 103.36
Step by Step Solution
- Step 1: Write the proportion equation
84.20 : 126.16 = 68.99 : x - Step 2: Convert to fraction form
84.20/126.16 = 68.99/x - Step 3: Cross multiply
84.20x = 126.16 × 68.99 - Step 4: Simplify right side
84.20x = 8,702.80 - Step 5: Solve for x
x = 8,702.80/84.20 - Step 6: Final answer
x = 103.36
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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.