Finding the Fourth Proportional to 1,278,463,212.80, 1,917,694,819.20 and 865,214,691.20
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Solution
The fourth proportional to 1,278,463,212.80, 1,917,694,819.20 and 865,214,691.20 is: 1,297,822,036.80
Step by Step Solution
- Step 1: Write the proportion equation
1,278,463,212.80 : 1,917,694,819.20 = 865,214,691.20 : x - Step 2: Convert to fraction form
1,278,463,212.80/1,917,694,819.20 = 865,214,691.20/x - Step 3: Cross multiply
1,278,463,212.80x = 1,917,694,819.20 × 865,214,691.20 - Step 4: Simplify right side
1,278,463,212.80x = 1,659,217,730,809,967,872 - Step 5: Solve for x
x = 1,659,217,730,809,967,872/1,278,463,212.80 - Step 6: Final answer
x = 1,297,822,036.80
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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.