Finding the Fourth Proportional to 790,566,571.20, 1,090,981,971.68 and 438,165,313.60
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Solution
The fourth proportional to 790,566,571.20, 1,090,981,971.68 and 438,165,313.60 is: 604,668,190.09
Step by Step Solution
- Step 1: Write the proportion equation
790,566,571.20 : 1,090,981,971.68 = 438,165,313.60 : x - Step 2: Convert to fraction form
790,566,571.20/1,090,981,971.68 = 438,165,313.60/x - Step 3: Cross multiply
790,566,571.20x = 1,090,981,971.68 × 438,165,313.60 - Step 4: Simplify right side
790,566,571.20x = 478,030,457,753,113,600 - Step 5: Solve for x
x = 478,030,457,753,113,600/790,566,571.20 - Step 6: Final answer
x = 604,668,190.09
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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.