Finding the Fourth Proportional to 128,432.75, 177,272.81 and 74,728.14
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Solution
The fourth proportional to 128,432.75, 177,272.81 and 74,728.14 is: 103,145.56
Step by Step Solution
- Step 1: Write the proportion equation
128,432.75 : 177,272.81 = 74,728.14 : x - Step 2: Convert to fraction form
128,432.75/177,272.81 = 74,728.14/x - Step 3: Cross multiply
128,432.75x = 177,272.81 × 74,728.14 - Step 4: Simplify right side
128,432.75x = 13,247,266,990.23 - Step 5: Solve for x
x = 13,247,266,990.23/128,432.75 - Step 6: Final answer
x = 103,145.56
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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.