Finding the Fourth Proportional to 715,977,906.81, 988,042,372.75 and 398,432,713.66
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Solution
The fourth proportional to 715,977,906.81, 988,042,372.75 and 398,432,713.66 is: 549,833,172.28
Step by Step Solution
- Step 1: Write the proportion equation
715,977,906.81 : 988,042,372.75 = 398,432,713.66 : x - Step 2: Convert to fraction form
715,977,906.81/988,042,372.75 = 398,432,713.66/x - Step 3: Cross multiply
715,977,906.81x = 988,042,372.75 × 398,432,713.66 - Step 4: Simplify right side
715,977,906.81x = 393,668,403,785,847,744 - Step 5: Solve for x
x = 393,668,403,785,847,744/715,977,906.81 - Step 6: Final answer
x = 549,833,172.28
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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.