Finding the Fourth Proportional to 129,138,242.85, 178,209,073.22 and 72,622,971.99
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Solution
The fourth proportional to 129,138,242.85, 178,209,073.22 and 72,622,971.99 is: 100,218,744.25
Step by Step Solution
- Step 1: Write the proportion equation
129,138,242.85 : 178,209,073.22 = 72,622,971.99 : x - Step 2: Convert to fraction form
129,138,242.85/178,209,073.22 = 72,622,971.99/x - Step 3: Cross multiply
129,138,242.85x = 178,209,073.22 × 72,622,971.99 - Step 4: Simplify right side
129,138,242.85x = 12,942,072,532,456,804 - Step 5: Solve for x
x = 12,942,072,532,456,804/129,138,242.85 - Step 6: Final answer
x = 100,218,744.25
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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.