Finding the Fourth Proportional to 1,128,391.21, 1,557,285.33 and 644,861.92
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Solution
The fourth proportional to 1,128,391.21, 1,557,285.33 and 644,861.92 is: 889,969.72
Step by Step Solution
- Step 1: Write the proportion equation
1,128,391.21 : 1,557,285.33 = 644,861.92 : x - Step 2: Convert to fraction form
1,128,391.21/1,557,285.33 = 644,861.92/x - Step 3: Cross multiply
1,128,391.21x = 1,557,285.33 × 644,861.92 - Step 4: Simplify right side
1,128,391.21x = 1,004,234,007,891.63 - Step 5: Solve for x
x = 1,004,234,007,891.63/1,128,391.21 - Step 6: Final answer
x = 889,969.72
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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.