Finding the Fourth Proportional to 485,873.20, 728,809.80 and 420,919.30
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Solution
The fourth proportional to 485,873.20, 728,809.80 and 420,919.30 is: 631,378.95
Step by Step Solution
- Step 1: Write the proportion equation
485,873.20 : 728,809.80 = 420,919.30 : x - Step 2: Convert to fraction form
485,873.20/728,809.80 = 420,919.30/x - Step 3: Cross multiply
485,873.20x = 728,809.80 × 420,919.30 - Step 4: Simplify right side
485,873.20x = 306,770,110,849.14 - Step 5: Solve for x
x = 306,770,110,849.14/485,873.20 - Step 6: Final answer
x = 631,378.95
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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.