Finding the Fourth Proportional to 100,390.19, 138,515.67 and 68,129.17
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Solution
The fourth proportional to 100,390.19, 138,515.67 and 68,129.17 is: 94,002.79
Step by Step Solution
- Step 1: Write the proportion equation
100,390.19 : 138,515.67 = 68,129.17 : x - Step 2: Convert to fraction form
100,390.19/138,515.67 = 68,129.17/x - Step 3: Cross multiply
100,390.19x = 138,515.67 × 68,129.17 - Step 4: Simplify right side
100,390.19x = 9,436,957,282.80 - Step 5: Solve for x
x = 9,436,957,282.80/100,390.19 - Step 6: Final answer
x = 94,002.79
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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.