Finding the Fourth Proportional to 128,776.73, 177,757.90 and 87,911.62
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Solution
The fourth proportional to 128,776.73, 177,757.90 and 87,911.62 is: 121,349.45
Step by Step Solution
- Step 1: Write the proportion equation
128,776.73 : 177,757.90 = 87,911.62 : x - Step 2: Convert to fraction form
128,776.73/177,757.90 = 87,911.62/x - Step 3: Cross multiply
128,776.73x = 177,757.90 × 87,911.62 - Step 4: Simplify right side
128,776.73x = 15,626,984,292.62 - Step 5: Solve for x
x = 15,626,984,292.62/128,776.73 - Step 6: Final answer
x = 121,349.45
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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.