Finding the Fourth Proportional to 1,290,217.20, 1,780,607.52 and 717,310.68
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Solution
The fourth proportional to 1,290,217.20, 1,780,607.52 and 717,310.68 is: 989,948.66
Step by Step Solution
- Step 1: Write the proportion equation
1,290,217.20 : 1,780,607.52 = 717,310.68 : x - Step 2: Convert to fraction form
1,290,217.20/1,780,607.52 = 717,310.68/x - Step 3: Cross multiply
1,290,217.20x = 1,780,607.52 × 717,310.68 - Step 4: Simplify right side
1,290,217.20x = 1,277,248,790,984.31 - Step 5: Solve for x
x = 1,277,248,790,984.31/1,290,217.20 - Step 6: Final answer
x = 989,948.66
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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.