Finding the Fourth Proportional to 138,318.39, 207,144.99 and 78,974.19
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Solution
The fourth proportional to 138,318.39, 207,144.99 and 78,974.19 is: 118,271.39
Step by Step Solution
- Step 1: Write the proportion equation
138,318.39 : 207,144.99 = 78,974.19 : x - Step 2: Convert to fraction form
138,318.39/207,144.99 = 78,974.19/x - Step 3: Cross multiply
138,318.39x = 207,144.99 × 78,974.19 - Step 4: Simplify right side
138,318.39x = 16,359,107,797.81 - Step 5: Solve for x
x = 16,359,107,797.81/138,318.39 - Step 6: Final answer
x = 118,271.39
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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.