Finding the Fourth Proportional to 1,438,217.40, 2,158,103.70 and 639,622.20
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Solution
The fourth proportional to 1,438,217.40, 2,158,103.70 and 639,622.20 is: 959,779.12
Step by Step Solution
- Step 1: Write the proportion equation
1,438,217.40 : 2,158,103.70 = 639,622.20 : x - Step 2: Convert to fraction form
1,438,217.40/2,158,103.70 = 639,622.20/x - Step 3: Cross multiply
1,438,217.40x = 2,158,103.70 × 639,622.20 - Step 4: Simplify right side
1,438,217.40x = 1,380,371,036,422.14 - Step 5: Solve for x
x = 1,380,371,036,422.14/1,438,217.40 - Step 6: Final answer
x = 959,779.12
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1.5x scale
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.