Finding the Fourth Proportional to 128,777.76, 177,721.84 and 72,192.80
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Solution
The fourth proportional to 128,777.76, 177,721.84 and 72,192.80 is: 99,630.85
Step by Step Solution
- Step 1: Write the proportion equation
128,777.76 : 177,721.84 = 72,192.80 : x - Step 2: Convert to fraction form
128,777.76/177,721.84 = 72,192.80/x - Step 3: Cross multiply
128,777.76x = 177,721.84 × 72,192.80 - Step 4: Simplify right side
128,777.76x = 12,830,237,250.75 - Step 5: Solve for x
x = 12,830,237,250.75/128,777.76 - Step 6: Final answer
x = 99,630.85
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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.