Finding the Fourth Proportional to 721,416,507.87, 995,550,623.31 and 391,384,560.99
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Solution
The fourth proportional to 721,416,507.87, 995,550,623.31 and 391,384,560.99 is: 540,108,438.60
Step by Step Solution
- Step 1: Write the proportion equation
721,416,507.87 : 995,550,623.31 = 391,384,560.99 : x - Step 2: Convert to fraction form
721,416,507.87/995,550,623.31 = 391,384,560.99/x - Step 3: Cross multiply
721,416,507.87x = 995,550,623.31 × 391,384,560.99 - Step 4: Simplify right side
721,416,507.87x = 389,643,143,647,505,216 - Step 5: Solve for x
x = 389,643,143,647,505,216/721,416,507.87 - Step 6: Final answer
x = 540,108,438.60
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.