Finding the Fourth Proportional to 121,286.20, 181,929.30 and 91,761.70
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Solution
The fourth proportional to 121,286.20, 181,929.30 and 91,761.70 is: 137,642.55
Step by Step Solution
- Step 1: Write the proportion equation
121,286.20 : 181,929.30 = 91,761.70 : x - Step 2: Convert to fraction form
121,286.20/181,929.30 = 91,761.70/x - Step 3: Cross multiply
121,286.20x = 181,929.30 × 91,761.70 - Step 4: Simplify right side
121,286.20x = 16,694,141,847.81 - Step 5: Solve for x
x = 16,694,141,847.81/121,286.20 - Step 6: Final answer
x = 137,642.55
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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.