Finding the Fourth Proportional to 139,243.12, 192,152.64 and 78,812.68
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Solution
The fourth proportional to 139,243.12, 192,152.64 and 78,812.68 is: 108,759.88
Step by Step Solution
- Step 1: Write the proportion equation
139,243.12 : 192,152.64 = 78,812.68 : x - Step 2: Convert to fraction form
139,243.12/192,152.64 = 78,812.68/x - Step 3: Cross multiply
139,243.12x = 192,152.64 × 78,812.68 - Step 4: Simplify right side
139,243.12x = 15,144,064,527.48 - Step 5: Solve for x
x = 15,144,064,527.48/139,243.12 - Step 6: Final answer
x = 108,759.88
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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.