Finding the Fourth Proportional to 138,639.80, 207,959.70 and 68,504.60
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Solution
The fourth proportional to 138,639.80, 207,959.70 and 68,504.60 is: 102,756.90
Step by Step Solution
- Step 1: Write the proportion equation
138,639.80 : 207,959.70 = 68,504.60 : x - Step 2: Convert to fraction form
138,639.80/207,959.70 = 68,504.60/x - Step 3: Cross multiply
138,639.80x = 207,959.70 × 68,504.60 - Step 4: Simplify right side
138,639.80x = 14,246,196,064.62 - Step 5: Solve for x
x = 14,246,196,064.62/138,639.80 - Step 6: Final answer
x = 102,756.90
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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.