Finding the Fourth Proportional to 138,427.20, 207,640.80 and 120,931.20
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Solution
The fourth proportional to 138,427.20, 207,640.80 and 120,931.20 is: 181,396.80
Step by Step Solution
- Step 1: Write the proportion equation
138,427.20 : 207,640.80 = 120,931.20 : x - Step 2: Convert to fraction form
138,427.20/207,640.80 = 120,931.20/x - Step 3: Cross multiply
138,427.20x = 207,640.80 × 120,931.20 - Step 4: Simplify right side
138,427.20x = 25,110,251,112.96 - Step 5: Solve for x
x = 25,110,251,112.96/138,427.20 - Step 6: Final answer
x = 181,396.80
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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.