Finding the Fourth Proportional to 207,454.20, 311,411.70 and 128,657.40
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Solution
The fourth proportional to 207,454.20, 311,411.70 and 128,657.40 is: 193,128.99
Step by Step Solution
- Step 1: Write the proportion equation
207,454.20 : 311,411.70 = 128,657.40 : x - Step 2: Convert to fraction form
207,454.20/311,411.70 = 128,657.40/x - Step 3: Cross multiply
207,454.20x = 311,411.70 × 128,657.40 - Step 4: Simplify right side
207,454.20x = 40,065,419,651.58 - Step 5: Solve for x
x = 40,065,419,651.58/207,454.20 - Step 6: Final answer
x = 193,128.99
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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.