Finding the Fourth Proportional to 391,135.43, 539,674.38 and 221,369.55
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Solution
The fourth proportional to 391,135.43, 539,674.38 and 221,369.55 is: 305,437.62
Step by Step Solution
- Step 1: Write the proportion equation
391,135.43 : 539,674.38 = 221,369.55 : x - Step 2: Convert to fraction form
391,135.43/539,674.38 = 221,369.55/x - Step 3: Cross multiply
391,135.43x = 539,674.38 × 221,369.55 - Step 4: Simplify right side
391,135.43x = 119,467,474,647.13 - Step 5: Solve for x
x = 119,467,474,647.13/391,135.43 - Step 6: Final answer
x = 305,437.62
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.