Finding the Fourth Proportional to 128,959.80, 193,439.70 and 40,212.60
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Solution
The fourth proportional to 128,959.80, 193,439.70 and 40,212.60 is: 60,318.90
Step by Step Solution
- Step 1: Write the proportion equation
128,959.80 : 193,439.70 = 40,212.60 : x - Step 2: Convert to fraction form
128,959.80/193,439.70 = 40,212.60/x - Step 3: Cross multiply
128,959.80x = 193,439.70 × 40,212.60 - Step 4: Simplify right side
128,959.80x = 7,778,713,280.22 - Step 5: Solve for x
x = 7,778,713,280.22/128,959.80 - Step 6: Final answer
x = 60,318.90
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1.5x scale
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.