Finding the Fourth Proportional to 129,114.24, 178,211.52 and 72,543.84
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Solution
The fourth proportional to 129,114.24, 178,211.52 and 72,543.84 is: 100,129.53
Step by Step Solution
- Step 1: Write the proportion equation
129,114.24 : 178,211.52 = 72,543.84 : x - Step 2: Convert to fraction form
129,114.24/178,211.52 = 72,543.84/x - Step 3: Cross multiply
129,114.24x = 178,211.52 × 72,543.84 - Step 4: Simplify right side
129,114.24x = 12,928,147,993.04 - Step 5: Solve for x
x = 12,928,147,993.04/129,114.24 - Step 6: Final answer
x = 100,129.53
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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.