Finding the Fourth Proportional to 1,392,012.87, 1,921,137.12 and 780,330.84
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Solution
The fourth proportional to 1,392,012.87, 1,921,137.12 and 780,330.84 is: 1,076,945.89
Step by Step Solution
- Step 1: Write the proportion equation
1,392,012.87 : 1,921,137.12 = 780,330.84 : x - Step 2: Convert to fraction form
1,392,012.87/1,921,137.12 = 780,330.84/x - Step 3: Cross multiply
1,392,012.87x = 1,921,137.12 × 780,330.84 - Step 4: Simplify right side
1,392,012.87x = 1,499,122,542,604.78 - Step 5: Solve for x
x = 1,499,122,542,604.78/1,392,012.87 - Step 6: Final answer
x = 1,076,945.89
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.