Finding the Fourth Proportional to 128,720.20, 193,080.30 and 86,729.80
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Solution
The fourth proportional to 128,720.20, 193,080.30 and 86,729.80 is: 130,094.70
Step by Step Solution
- Step 1: Write the proportion equation
128,720.20 : 193,080.30 = 86,729.80 : x - Step 2: Convert to fraction form
128,720.20/193,080.30 = 86,729.80/x - Step 3: Cross multiply
128,720.20x = 193,080.30 × 86,729.80 - Step 4: Simplify right side
128,720.20x = 16,745,815,802.94 - Step 5: Solve for x
x = 16,745,815,802.94/128,720.20 - Step 6: Final answer
x = 130,094.70
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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.