Finding the Fourth Proportional to 138,689.80, 208,034.70 and 115,361.80
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Solution
The fourth proportional to 138,689.80, 208,034.70 and 115,361.80 is: 173,042.70
Step by Step Solution
- Step 1: Write the proportion equation
138,689.80 : 208,034.70 = 115,361.80 : x - Step 2: Convert to fraction form
138,689.80/208,034.70 = 115,361.80/x - Step 3: Cross multiply
138,689.80x = 208,034.70 × 115,361.80 - Step 4: Simplify right side
138,689.80x = 23,999,257,454.46 - Step 5: Solve for x
x = 23,999,257,454.46/138,689.80 - Step 6: Final answer
x = 173,042.70
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.