Finding the Fourth Proportional to 128,912.37, 177,909.78 and 71,557.08
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Solution
The fourth proportional to 128,912.37, 177,909.78 and 71,557.08 is: 98,754.72
Step by Step Solution
- Step 1: Write the proportion equation
128,912.37 : 177,909.78 = 71,557.08 : x - Step 2: Convert to fraction form
128,912.37/177,909.78 = 71,557.08/x - Step 3: Cross multiply
128,912.37x = 177,909.78 × 71,557.08 - Step 4: Simplify right side
128,912.37x = 12,730,704,360.24 - Step 5: Solve for x
x = 12,730,704,360.24/128,912.37 - Step 6: Final answer
x = 98,754.72
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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.