Finding the Fourth Proportional to 81,315.20, 121,972.80 and 39,843.20
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Solution
The fourth proportional to 81,315.20, 121,972.80 and 39,843.20 is: 59,764.80
Step by Step Solution
- Step 1: Write the proportion equation
81,315.20 : 121,972.80 = 39,843.20 : x - Step 2: Convert to fraction form
81,315.20/121,972.80 = 39,843.20/x - Step 3: Cross multiply
81,315.20x = 121,972.80 × 39,843.20 - Step 4: Simplify right side
81,315.20x = 4,859,786,664.96 - Step 5: Solve for x
x = 4,859,786,664.96/81,315.20 - Step 6: Final answer
x = 59,764.80
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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.