Finding the Fourth Proportional to 128,203.20, 192,304.80 and 86,212.80
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Solution
The fourth proportional to 128,203.20, 192,304.80 and 86,212.80 is: 129,319.20
Step by Step Solution
- Step 1: Write the proportion equation
128,203.20 : 192,304.80 = 86,212.80 : x - Step 2: Convert to fraction form
128,203.20/192,304.80 = 86,212.80/x - Step 3: Cross multiply
128,203.20x = 192,304.80 × 86,212.80 - Step 4: Simplify right side
128,203.20x = 16,579,135,261.44 - Step 5: Solve for x
x = 16,579,135,261.44/128,203.20 - Step 6: Final answer
x = 129,319.20
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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.