Finding the Fourth Proportional to 100,687.36, 138,952.12 and 55,368.80
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Solution
The fourth proportional to 100,687.36, 138,952.12 and 55,368.80 is: 76,410.90
Step by Step Solution
- Step 1: Write the proportion equation
100,687.36 : 138,952.12 = 55,368.80 : x - Step 2: Convert to fraction form
100,687.36/138,952.12 = 55,368.80/x - Step 3: Cross multiply
100,687.36x = 138,952.12 × 55,368.80 - Step 4: Simplify right side
100,687.36x = 7,693,612,141.86 - Step 5: Solve for x
x = 7,693,612,141.86/100,687.36 - Step 6: Final answer
x = 76,410.90
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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.