Finding the Fourth Proportional to 138,343.20, 190,905.84 and 81,759.84
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Solution
The fourth proportional to 138,343.20, 190,905.84 and 81,759.84 is: 112,823.98
Step by Step Solution
- Step 1: Write the proportion equation
138,343.20 : 190,905.84 = 81,759.84 : x - Step 2: Convert to fraction form
138,343.20/190,905.84 = 81,759.84/x - Step 3: Cross multiply
138,343.20x = 190,905.84 × 81,759.84 - Step 4: Simplify right side
138,343.20x = 15,608,430,933.47 - Step 5: Solve for x
x = 15,608,430,933.47/138,343.20 - Step 6: Final answer
x = 112,823.98
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.