Finding the Fourth Proportional to 428,769.20, 642,946.08 and 129,193.94
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Solution
The fourth proportional to 428,769.20, 642,946.08 and 129,193.94 is: 193,728.32
Step by Step Solution
- Step 1: Write the proportion equation
428,769.20 : 642,946.08 = 129,193.94 : x - Step 2: Convert to fraction form
428,769.20/642,946.08 = 129,193.94/x - Step 3: Cross multiply
428,769.20x = 642,946.08 × 129,193.94 - Step 4: Simplify right side
428,769.20x = 83,064,737,282.76 - Step 5: Solve for x
x = 83,064,737,282.76/428,769.20 - Step 6: Final answer
x = 193,728.32
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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.