Finding the Fourth Proportional to 100,708.20, 138,974.52 and 55,386.18
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Solution
The fourth proportional to 100,708.20, 138,974.52 and 55,386.18 is: 76,431.39
Step by Step Solution
- Step 1: Write the proportion equation
100,708.20 : 138,974.52 = 55,386.18 : x - Step 2: Convert to fraction form
100,708.20/138,974.52 = 55,386.18/x - Step 3: Cross multiply
100,708.20x = 138,974.52 × 55,386.18 - Step 4: Simplify right side
100,708.20x = 7,697,267,780.13 - Step 5: Solve for x
x = 7,697,267,780.13/100,708.20 - Step 6: Final answer
x = 76,431.39
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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.