Finding the Fourth Proportional to 919,936,901.20, 1,379,905,351.80 and 428,486,836.45
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Solution
The fourth proportional to 919,936,901.20, 1,379,905,351.80 and 428,486,836.45 is: 642,730,254.68
Step by Step Solution
- Step 1: Write the proportion equation
919,936,901.20 : 1,379,905,351.80 = 428,486,836.45 : x - Step 2: Convert to fraction form
919,936,901.20/1,379,905,351.80 = 428,486,836.45/x - Step 3: Cross multiply
919,936,901.20x = 1,379,905,351.80 × 428,486,836.45 - Step 4: Simplify right side
919,936,901.20x = 591,271,278,793,206,272 - Step 5: Solve for x
x = 591,271,278,793,206,272/919,936,901.20 - Step 6: Final answer
x = 642,730,254.68
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Double scale
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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.