Finding the Fourth Proportional to 1,420,207,621.80, 2,128,967,739.90 and 838,388,639.40
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Solution
The fourth proportional to 1,420,207,621.80, 2,128,967,739.90 and 838,388,639.40 is: 1,256,789,739.32
Step by Step Solution
- Step 1: Write the proportion equation
1,420,207,621.80 : 2,128,967,739.90 = 838,388,639.40 : x - Step 2: Convert to fraction form
1,420,207,621.80/2,128,967,739.90 = 838,388,639.40/x - Step 3: Cross multiply
1,420,207,621.80x = 2,128,967,739.90 × 838,388,639.40 - Step 4: Simplify right side
1,420,207,621.80x = 1,784,902,366,781,254,144 - Step 5: Solve for x
x = 1,784,902,366,781,254,144/1,420,207,621.80 - Step 6: Final answer
x = 1,256,789,739.32
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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.