Finding the Fourth Proportional to 85,724.80, 128,660.10 and 38,412.70
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Solution
The fourth proportional to 85,724.80, 128,660.10 and 38,412.70 is: 57,651.72
Step by Step Solution
- Step 1: Write the proportion equation
85,724.80 : 128,660.10 = 38,412.70 : x - Step 2: Convert to fraction form
85,724.80/128,660.10 = 38,412.70/x - Step 3: Cross multiply
85,724.80x = 128,660.10 × 38,412.70 - Step 4: Simplify right side
85,724.80x = 4,942,181,823.27 - Step 5: Solve for x
x = 4,942,181,823.27/85,724.80 - Step 6: Final answer
x = 57,651.72
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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.