Finding the Fourth Proportional to 129,448.13, 178,546.39 and 86,405.92
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Solution
The fourth proportional to 129,448.13, 178,546.39 and 86,405.92 is: 119,178.74
Step by Step Solution
- Step 1: Write the proportion equation
129,448.13 : 178,546.39 = 86,405.92 : x - Step 2: Convert to fraction form
129,448.13/178,546.39 = 86,405.92/x - Step 3: Cross multiply
129,448.13x = 178,546.39 × 86,405.92 - Step 4: Simplify right side
129,448.13x = 15,427,464,428.25 - Step 5: Solve for x
x = 15,427,464,428.25/129,448.13 - Step 6: Final answer
x = 119,178.74
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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.