Finding the Fourth Proportional to 1,990,720,126.40, 2,986,080,189.60 and 1,259,751,243.20
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Solution
The fourth proportional to 1,990,720,126.40, 2,986,080,189.60 and 1,259,751,243.20 is: 1,889,626,864.80
Step by Step Solution
- Step 1: Write the proportion equation
1,990,720,126.40 : 2,986,080,189.60 = 1,259,751,243.20 : x - Step 2: Convert to fraction form
1,990,720,126.40/2,986,080,189.60 = 1,259,751,243.20/x - Step 3: Cross multiply
1,990,720,126.40x = 2,986,080,189.60 × 1,259,751,243.20 - Step 4: Simplify right side
1,990,720,126.40x = 3,761,718,231,143,491,584 - Step 5: Solve for x
x = 3,761,718,231,143,491,584/1,990,720,126.40 - Step 6: Final answer
x = 1,889,626,864.80
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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.