Finding the Fourth Proportional to 128,765.75, 177,696.09 and 72,177.12
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Solution
The fourth proportional to 128,765.75, 177,696.09 and 72,177.12 is: 99,604.07
Step by Step Solution
- Step 1: Write the proportion equation
128,765.75 : 177,696.09 = 72,177.12 : x - Step 2: Convert to fraction form
128,765.75/177,696.09 = 72,177.12/x - Step 3: Cross multiply
128,765.75x = 177,696.09 × 72,177.12 - Step 4: Simplify right side
128,765.75x = 12,825,592,011.46 - Step 5: Solve for x
x = 12,825,592,011.46/128,765.75 - Step 6: Final answer
x = 99,604.07
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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.