Finding the Fourth Proportional to 138,638.58, 207,936.18 and 45,143.70
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Solution
The fourth proportional to 138,638.58, 207,936.18 and 45,143.70 is: 67,708.49
Step by Step Solution
- Step 1: Write the proportion equation
138,638.58 : 207,936.18 = 45,143.70 : x - Step 2: Convert to fraction form
138,638.58/207,936.18 = 45,143.70/x - Step 3: Cross multiply
138,638.58x = 207,936.18 × 45,143.70 - Step 4: Simplify right side
138,638.58x = 9,387,008,529.07 - Step 5: Solve for x
x = 9,387,008,529.07/138,638.58 - Step 6: Final answer
x = 67,708.49
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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.