Finding the Fourth Proportional to 128,966.66, 177,990.39 and 72,378.03
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Solution
The fourth proportional to 128,966.66, 177,990.39 and 72,378.03 is: 99,890.88
Step by Step Solution
- Step 1: Write the proportion equation
128,966.66 : 177,990.39 = 72,378.03 : x - Step 2: Convert to fraction form
128,966.66/177,990.39 = 72,378.03/x - Step 3: Cross multiply
128,966.66x = 177,990.39 × 72,378.03 - Step 4: Simplify right side
128,966.66x = 12,882,593,787.13 - Step 5: Solve for x
x = 12,882,593,787.13/128,966.66 - Step 6: Final answer
x = 99,890.88
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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.