Finding the Fourth Proportional to 128,415.31, 177,203.50 and 71,815.75
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Solution
The fourth proportional to 128,415.31, 177,203.50 and 71,815.75 is: 99,100.35
Step by Step Solution
- Step 1: Write the proportion equation
128,415.31 : 177,203.50 = 71,815.75 : x - Step 2: Convert to fraction form
128,415.31/177,203.50 = 71,815.75/x - Step 3: Cross multiply
128,415.31x = 177,203.50 × 71,815.75 - Step 4: Simplify right side
128,415.31x = 12,726,002,255.13 - Step 5: Solve for x
x = 12,726,002,255.13/128,415.31 - Step 6: Final answer
x = 99,100.35
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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.