Finding the Fourth Proportional to 1,129,209.21, 1,558,107.63 and 639,176.40
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Solution
The fourth proportional to 1,129,209.21, 1,558,107.63 and 639,176.40 is: 881,949.61
Step by Step Solution
- Step 1: Write the proportion equation
1,129,209.21 : 1,558,107.63 = 639,176.40 : x - Step 2: Convert to fraction form
1,129,209.21/1,558,107.63 = 639,176.40/x - Step 3: Cross multiply
1,129,209.21x = 1,558,107.63 × 639,176.40 - Step 4: Simplify right side
1,129,209.21x = 995,905,625,755.93 - Step 5: Solve for x
x = 995,905,625,755.93/1,129,209.21 - Step 6: Final answer
x = 881,949.61
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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.