Finding the Fourth Proportional to 428,932.20, 643,402.92 and 129,415.44
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Solution
The fourth proportional to 428,932.20, 643,402.92 and 129,415.44 is: 194,124.55
Step by Step Solution
- Step 1: Write the proportion equation
428,932.20 : 643,402.92 = 129,415.44 : x - Step 2: Convert to fraction form
428,932.20/643,402.92 = 129,415.44/x - Step 3: Cross multiply
428,932.20x = 643,402.92 × 129,415.44 - Step 4: Simplify right side
428,932.20x = 83,266,271,989.08 - Step 5: Solve for x
x = 83,266,271,989.08/428,932.20 - Step 6: Final answer
x = 194,124.55
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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.