Finding the Fourth Proportional to 81,491.20, 122,236.80 and 71,649.70
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Solution
The fourth proportional to 81,491.20, 122,236.80 and 71,649.70 is: 107,474.55
Step by Step Solution
- Step 1: Write the proportion equation
81,491.20 : 122,236.80 = 71,649.70 : x - Step 2: Convert to fraction form
81,491.20/122,236.80 = 71,649.70/x - Step 3: Cross multiply
81,491.20x = 122,236.80 × 71,649.70 - Step 4: Simplify right side
81,491.20x = 8,758,230,048.96 - Step 5: Solve for x
x = 8,758,230,048.96/81,491.20 - Step 6: Final answer
x = 107,474.55
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1.5x scale
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.