Finding the Fourth Proportional to 128,820.38, 177,772.12 and 72,231.75
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Solution
The fourth proportional to 128,820.38, 177,772.12 and 72,231.75 is: 99,679.82
Step by Step Solution
- Step 1: Write the proportion equation
128,820.38 : 177,772.12 = 72,231.75 : x - Step 2: Convert to fraction form
128,820.38/177,772.12 = 72,231.75/x - Step 3: Cross multiply
128,820.38x = 177,772.12 × 72,231.75 - Step 4: Simplify right side
128,820.38x = 12,840,791,148.23 - Step 5: Solve for x
x = 12,840,791,148.23/128,820.38 - Step 6: Final answer
x = 99,679.82
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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.