Finding the Fourth Proportional to 128,780.76, 177,725.98 and 72,195.80
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Solution
The fourth proportional to 128,780.76, 177,725.98 and 72,195.80 is: 99,634.99
Step by Step Solution
- Step 1: Write the proportion equation
128,780.76 : 177,725.98 = 72,195.80 : x - Step 2: Convert to fraction form
128,780.76/177,725.98 = 72,195.80/x - Step 3: Cross multiply
128,780.76x = 177,725.98 × 72,195.80 - Step 4: Simplify right side
128,780.76x = 12,831,069,306.88 - Step 5: Solve for x
x = 12,831,069,306.88/128,780.76 - Step 6: Final answer
x = 99,634.99
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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.