Finding the Fourth Proportional to 639.36, 881.86 and 450
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Solution
The fourth proportional to 639.36, 881.86 and 450 is: 620.68
Step by Step Solution
- Step 1: Write the proportion equation
639.36 : 881.86 = 450 : x - Step 2: Convert to fraction form
639.36/881.86 = 450/x - Step 3: Cross multiply
639.36x = 881.86 × 450 - Step 4: Simplify right side
639.36x = 396,837 - Step 5: Solve for x
x = 396,837/639.36 - Step 6: Final answer
x = 620.68
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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.