Finding the Fourth Proportional to 128,517.18, 177,353.68 and 71,928.54
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Solution
The fourth proportional to 128,517.18, 177,353.68 and 71,928.54 is: 99,261.37
Step by Step Solution
- Step 1: Write the proportion equation
128,517.18 : 177,353.68 = 71,928.54 : x - Step 2: Convert to fraction form
128,517.18/177,353.68 = 71,928.54/x - Step 3: Cross multiply
128,517.18x = 177,353.68 × 71,928.54 - Step 4: Simplify right side
128,517.18x = 12,756,791,266.03 - Step 5: Solve for x
x = 12,756,791,266.03/128,517.18 - Step 6: Final answer
x = 99,261.37
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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.