Finding the Fourth Proportional to 1,327,720,408.80, 1,991,580,613.20 and 638,972,872.80
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Solution
The fourth proportional to 1,327,720,408.80, 1,991,580,613.20 and 638,972,872.80 is: 958,459,309.20
Step by Step Solution
- Step 1: Write the proportion equation
1,327,720,408.80 : 1,991,580,613.20 = 638,972,872.80 : x - Step 2: Convert to fraction form
1,327,720,408.80/1,991,580,613.20 = 638,972,872.80/x - Step 3: Cross multiply
1,327,720,408.80x = 1,991,580,613.20 × 638,972,872.80 - Step 4: Simplify right side
1,327,720,408.80x = 1,272,565,985,829,189,632 - Step 5: Solve for x
x = 1,272,565,985,829,189,632/1,327,720,408.80 - Step 6: Final answer
x = 958,459,309.20
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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.