Finding the Fourth Proportional to 128,438.92, 177,246.21 and 71,850.34
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Solution
The fourth proportional to 128,438.92, 177,246.21 and 71,850.34 is: 99,153.75
Step by Step Solution
- Step 1: Write the proportion equation
128,438.92 : 177,246.21 = 71,850.34 : x - Step 2: Convert to fraction form
128,438.92/177,246.21 = 71,850.34/x - Step 3: Cross multiply
128,438.92x = 177,246.21 × 71,850.34 - Step 4: Simplify right side
128,438.92x = 12,735,200,452.21 - Step 5: Solve for x
x = 12,735,200,452.21/128,438.92 - Step 6: Final answer
x = 99,153.75
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.