Finding the Fourth Proportional to 128,579.36, 177,454.68 and 71,979.80
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Solution
The fourth proportional to 128,579.36, 177,454.68 and 71,979.80 is: 99,340.61
Step by Step Solution
- Step 1: Write the proportion equation
128,579.36 : 177,454.68 = 71,979.80 : x - Step 2: Convert to fraction form
128,579.36/177,454.68 = 71,979.80/x - Step 3: Cross multiply
128,579.36x = 177,454.68 × 71,979.80 - Step 4: Simplify right side
128,579.36x = 12,773,152,375.46 - Step 5: Solve for x
x = 12,773,152,375.46/128,579.36 - Step 6: Final answer
x = 99,340.61
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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.