Finding the Fourth Proportional to 638,578,721.80, 957,868,082.70 and 485,523,713.80
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Solution
The fourth proportional to 638,578,721.80, 957,868,082.70 and 485,523,713.80 is: 728,285,570.70
Step by Step Solution
- Step 1: Write the proportion equation
638,578,721.80 : 957,868,082.70 = 485,523,713.80 : x - Step 2: Convert to fraction form
638,578,721.80/957,868,082.70 = 485,523,713.80/x - Step 3: Cross multiply
638,578,721.80x = 957,868,082.70 × 485,523,713.80 - Step 4: Simplify right side
638,578,721.80x = 465,067,668,842,989,568 - Step 5: Solve for x
x = 465,067,668,842,989,568/638,578,721.80 - Step 6: Final answer
x = 728,285,570.70
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Double scale
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Similar ratio
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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.