Finding the Fourth Proportional to 128,416.38, 177,215.21 and 71,827.75
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Solution
The fourth proportional to 128,416.38, 177,215.21 and 71,827.75 is: 99,122.63
Step by Step Solution
- Step 1: Write the proportion equation
128,416.38 : 177,215.21 = 71,827.75 : x - Step 2: Convert to fraction form
128,416.38/177,215.21 = 71,827.75/x - Step 3: Cross multiply
128,416.38x = 177,215.21 × 71,827.75 - Step 4: Simplify right side
128,416.38x = 12,728,969,800.08 - Step 5: Solve for x
x = 12,728,969,800.08/128,416.38 - Step 6: Final answer
x = 99,122.63
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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.