Finding the Fourth Proportional to 128,427.84, 177,229.92 and 71,839.08
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Solution
The fourth proportional to 128,427.84, 177,229.92 and 71,839.08 is: 99,137.65
Step by Step Solution
- Step 1: Write the proportion equation
128,427.84 : 177,229.92 = 71,839.08 : x - Step 2: Convert to fraction form
128,427.84/177,229.92 = 71,839.08/x - Step 3: Cross multiply
128,427.84x = 177,229.92 × 71,839.08 - Step 4: Simplify right side
128,427.84x = 12,732,034,401.27 - Step 5: Solve for x
x = 12,732,034,401.27/128,427.84 - Step 6: Final answer
x = 99,137.65
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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.