Finding the Fourth Proportional to 129,208.80, 178,362.72 and 121,138.08
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Solution
The fourth proportional to 129,208.80, 178,362.72 and 121,138.08 is: 167,221.72
Step by Step Solution
- Step 1: Write the proportion equation
129,208.80 : 178,362.72 = 121,138.08 : x - Step 2: Convert to fraction form
129,208.80/178,362.72 = 121,138.08/x - Step 3: Cross multiply
129,208.80x = 178,362.72 × 121,138.08 - Step 4: Simplify right side
129,208.80x = 21,606,517,444.38 - Step 5: Solve for x
x = 21,606,517,444.38/129,208.80 - Step 6: Final answer
x = 167,221.72
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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.