Finding the Fourth Proportional to 1,328,869,135.20, 1,993,303,702.80 and 638,609,944.80
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Solution
The fourth proportional to 1,328,869,135.20, 1,993,303,702.80 and 638,609,944.80 is: 957,914,917.20
Step by Step Solution
- Step 1: Write the proportion equation
1,328,869,135.20 : 1,993,303,702.80 = 638,609,944.80 : x - Step 2: Convert to fraction form
1,328,869,135.20/1,993,303,702.80 = 638,609,944.80/x - Step 3: Cross multiply
1,328,869,135.20x = 1,993,303,702.80 × 638,609,944.80 - Step 4: Simplify right side
1,328,869,135.20x = 1,272,943,567,614,743,552 - Step 5: Solve for x
x = 1,272,943,567,614,743,552/1,328,869,135.20 - Step 6: Final answer
x = 957,914,917.20
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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.