Finding the Fourth Proportional to 128,538.80, 192,721.80 and 68,577.20
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Solution
The fourth proportional to 128,538.80, 192,721.80 and 68,577.20 is: 102,819.70
Step by Step Solution
- Step 1: Write the proportion equation
128,538.80 : 192,721.80 = 68,577.20 : x - Step 2: Convert to fraction form
128,538.80/192,721.80 = 68,577.20/x - Step 3: Cross multiply
128,538.80x = 192,721.80 × 68,577.20 - Step 4: Simplify right side
128,538.80x = 13,216,321,422.96 - Step 5: Solve for x
x = 13,216,321,422.96/128,538.80 - Step 6: Final answer
x = 102,819.70
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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.