Finding the Fourth Proportional to 128,299.88, 177,057.70 and 71,709.80
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Solution
The fourth proportional to 128,299.88, 177,057.70 and 71,709.80 is: 98,961.68
Step by Step Solution
- Step 1: Write the proportion equation
128,299.88 : 177,057.70 = 71,709.80 : x - Step 2: Convert to fraction form
128,299.88/177,057.70 = 71,709.80/x - Step 3: Cross multiply
128,299.88x = 177,057.70 × 71,709.80 - Step 4: Simplify right side
128,299.88x = 12,696,772,255.46 - Step 5: Solve for x
x = 12,696,772,255.46/128,299.88 - Step 6: Final answer
x = 98,961.68
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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.