Finding the Fourth Proportional to 100,419.75, 138,579.26 and 55,707.75
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Solution
The fourth proportional to 100,419.75, 138,579.26 and 55,707.75 is: 76,876.70
Step by Step Solution
- Step 1: Write the proportion equation
100,419.75 : 138,579.26 = 55,707.75 : x - Step 2: Convert to fraction form
100,419.75/138,579.26 = 55,707.75/x - Step 3: Cross multiply
100,419.75x = 138,579.26 × 55,707.75 - Step 4: Simplify right side
100,419.75x = 7,719,938,492.73 - Step 5: Solve for x
x = 7,719,938,492.73/100,419.75 - Step 6: Final answer
x = 76,876.70
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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.