Finding the Fourth Proportional to 128,421.40, 192,632.10 and 115,331.80
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Solution
The fourth proportional to 128,421.40, 192,632.10 and 115,331.80 is: 172,997.70
Step by Step Solution
- Step 1: Write the proportion equation
128,421.40 : 192,632.10 = 115,331.80 : x - Step 2: Convert to fraction form
128,421.40/192,632.10 = 115,331.80/x - Step 3: Cross multiply
128,421.40x = 192,632.10 × 115,331.80 - Step 4: Simplify right side
128,421.40x = 22,216,606,830.78 - Step 5: Solve for x
x = 22,216,606,830.78/128,421.40 - Step 6: Final answer
x = 172,997.70
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.