Finding the Fourth Proportional to 128,424.19, 177,215.75 and 71,824.63
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Solution
The fourth proportional to 128,424.19, 177,215.75 and 71,824.63 is: 99,112.60
Step by Step Solution
- Step 1: Write the proportion equation
128,424.19 : 177,215.75 = 71,824.63 : x - Step 2: Convert to fraction form
128,424.19/177,215.75 = 71,824.63/x - Step 3: Cross multiply
128,424.19x = 177,215.75 × 71,824.63 - Step 4: Simplify right side
128,424.19x = 12,728,454,787.84 - Step 5: Solve for x
x = 12,728,454,787.84/128,424.19 - Step 6: Final answer
x = 99,112.60
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1.5x scale
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.