Finding the Fourth Proportional to 1,321,149,851.28, 1,980,415,778.22 and 620,387,553.49
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Solution
The fourth proportional to 1,321,149,851.28, 1,980,415,778.22 and 620,387,553.49 is: 929,966,648.63
Step by Step Solution
- Step 1: Write the proportion equation
1,321,149,851.28 : 1,980,415,778.22 = 620,387,553.49 : x - Step 2: Convert to fraction form
1,321,149,851.28/1,980,415,778.22 = 620,387,553.49/x - Step 3: Cross multiply
1,321,149,851.28x = 1,980,415,778.22 × 620,387,553.49 - Step 4: Simplify right side
1,321,149,851.28x = 1,228,625,299,534,245,888 - Step 5: Solve for x
x = 1,228,625,299,534,245,888/1,321,149,851.28 - Step 6: Final answer
x = 929,966,648.63
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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.