Finding the Fourth Proportional to 128,754.81, 177,639.09 and 77,748.15
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Solution
The fourth proportional to 128,754.81, 177,639.09 and 77,748.15 is: 107,266.75
Step by Step Solution
- Step 1: Write the proportion equation
128,754.81 : 177,639.09 = 77,748.15 : x - Step 2: Convert to fraction form
128,754.81/177,639.09 = 77,748.15/x - Step 3: Cross multiply
128,754.81x = 177,639.09 × 77,748.15 - Step 4: Simplify right side
128,754.81x = 13,811,110,615.18 - Step 5: Solve for x
x = 13,811,110,615.18/128,754.81 - Step 6: Final answer
x = 107,266.75
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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.