Finding the Fourth Proportional to 128,780.35, 177,721.50 and 75,056.70
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Solution
The fourth proportional to 128,780.35, 177,721.50 and 75,056.70 is: 103,580.94
Step by Step Solution
- Step 1: Write the proportion equation
128,780.35 : 177,721.50 = 75,056.70 : x - Step 2: Convert to fraction form
128,780.35/177,721.50 = 75,056.70/x - Step 3: Cross multiply
128,780.35x = 177,721.50 × 75,056.70 - Step 4: Simplify right side
128,780.35x = 13,339,189,309.05 - Step 5: Solve for x
x = 13,339,189,309.05/128,780.35 - Step 6: Final answer
x = 103,580.94
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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.