Finding the Fourth Proportional to 718,744,138.75, 991,866,913.10 and 388,719,277.75
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Solution
The fourth proportional to 718,744,138.75, 991,866,913.10 and 388,719,277.75 is: 536,432,604.17
Step by Step Solution
- Step 1: Write the proportion equation
718,744,138.75 : 991,866,913.10 = 388,719,277.75 : x - Step 2: Convert to fraction form
718,744,138.75/991,866,913.10 = 388,719,277.75/x - Step 3: Cross multiply
718,744,138.75x = 991,866,913.10 × 388,719,277.75 - Step 4: Simplify right side
718,744,138.75x = 385,557,790,084,354,048 - Step 5: Solve for x
x = 385,557,790,084,354,048/718,744,138.75 - Step 6: Final answer
x = 536,432,604.17
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Double scale
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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.