Finding the Fourth Proportional to 81,205.20, 121,807.80 and 39,733.20
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Solution
The fourth proportional to 81,205.20, 121,807.80 and 39,733.20 is: 59,599.80
Step by Step Solution
- Step 1: Write the proportion equation
81,205.20 : 121,807.80 = 39,733.20 : x - Step 2: Convert to fraction form
81,205.20/121,807.80 = 39,733.20/x - Step 3: Cross multiply
81,205.20x = 121,807.80 × 39,733.20 - Step 4: Simplify right side
81,205.20x = 4,839,813,678.96 - Step 5: Solve for x
x = 4,839,813,678.96/81,205.20 - Step 6: Final answer
x = 59,599.80
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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.