Finding the Fourth Proportional to 139,138.41, 192,011.07 and 78,707.79
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Solution
The fourth proportional to 139,138.41, 192,011.07 and 78,707.79 is: 108,616.79
Step by Step Solution
- Step 1: Write the proportion equation
139,138.41 : 192,011.07 = 78,707.79 : x - Step 2: Convert to fraction form
139,138.41/192,011.07 = 78,707.79/x - Step 3: Cross multiply
139,138.41x = 192,011.07 × 78,707.79 - Step 4: Simplify right side
139,138.41x = 15,112,766,975.24 - Step 5: Solve for x
x = 15,112,766,975.24/139,138.41 - Step 6: Final answer
x = 108,616.79
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1.5x scale
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.