Finding the Fourth Proportional to 128,787.80, 177,793.92 and 100,043.06
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Solution
The fourth proportional to 128,787.80, 177,793.92 and 100,043.06 is: 138,111.28
Step by Step Solution
- Step 1: Write the proportion equation
128,787.80 : 177,793.92 = 100,043.06 : x - Step 2: Convert to fraction form
128,787.80/177,793.92 = 100,043.06/x - Step 3: Cross multiply
128,787.80x = 177,793.92 × 100,043.06 - Step 4: Simplify right side
128,787.80x = 17,787,046,917.23 - Step 5: Solve for x
x = 17,787,046,917.23/128,787.80 - Step 6: Final answer
x = 138,111.28
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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.