Finding the Fourth Proportional to 129,707.52, 178,969.14 and 78,747.09
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Solution
The fourth proportional to 129,707.52, 178,969.14 and 78,747.09 is: 108,654.45
Step by Step Solution
- Step 1: Write the proportion equation
129,707.52 : 178,969.14 = 78,747.09 : x - Step 2: Convert to fraction form
129,707.52/178,969.14 = 78,747.09/x - Step 3: Cross multiply
129,707.52x = 178,969.14 × 78,747.09 - Step 4: Simplify right side
129,707.52x = 14,093,298,974.80 - Step 5: Solve for x
x = 14,093,298,974.80/129,707.52 - Step 6: Final answer
x = 108,654.45
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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.