Finding the Fourth Proportional to 138,620.80, 207,931.20 and 75,635.20
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Solution
The fourth proportional to 138,620.80, 207,931.20 and 75,635.20 is: 113,452.80
Step by Step Solution
- Step 1: Write the proportion equation
138,620.80 : 207,931.20 = 75,635.20 : x - Step 2: Convert to fraction form
138,620.80/207,931.20 = 75,635.20/x - Step 3: Cross multiply
138,620.80x = 207,931.20 × 75,635.20 - Step 4: Simplify right side
138,620.80x = 15,726,917,898.24 - Step 5: Solve for x
x = 15,726,917,898.24/138,620.80 - Step 6: Final answer
x = 113,452.80
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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.