Finding the Fourth Proportional to 81,293.20, 121,939.80 and 68,171.20
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Solution
The fourth proportional to 81,293.20, 121,939.80 and 68,171.20 is: 102,256.80
Step by Step Solution
- Step 1: Write the proportion equation
81,293.20 : 121,939.80 = 68,171.20 : x - Step 2: Convert to fraction form
81,293.20/121,939.80 = 68,171.20/x - Step 3: Cross multiply
81,293.20x = 121,939.80 × 68,171.20 - Step 4: Simplify right side
81,293.20x = 8,312,782,493.76 - Step 5: Solve for x
x = 8,312,782,493.76/81,293.20 - Step 6: Final answer
x = 102,256.80
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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.