Finding the Fourth Proportional to 100,809.21, 139,115.62 and 55,486.23
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Solution
The fourth proportional to 100,809.21, 139,115.62 and 55,486.23 is: 76,570.39
Step by Step Solution
- Step 1: Write the proportion equation
100,809.21 : 139,115.62 = 55,486.23 : x - Step 2: Convert to fraction form
100,809.21/139,115.62 = 55,486.23/x - Step 3: Cross multiply
100,809.21x = 139,115.62 × 55,486.23 - Step 4: Simplify right side
100,809.21x = 7,719,000,453.62 - Step 5: Solve for x
x = 7,719,000,453.62/100,809.21 - Step 6: Final answer
x = 76,570.39
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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.