Finding the Fourth Proportional to 128,549.80, 177,396.76 and 71,963.20
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Solution
The fourth proportional to 128,549.80, 177,396.76 and 71,963.20 is: 99,308.12
Step by Step Solution
- Step 1: Write the proportion equation
128,549.80 : 177,396.76 = 71,963.20 : x - Step 2: Convert to fraction form
128,549.80/177,396.76 = 71,963.20/x - Step 3: Cross multiply
128,549.80x = 177,396.76 × 71,963.20 - Step 4: Simplify right side
128,549.80x = 12,766,038,519.23 - Step 5: Solve for x
x = 12,766,038,519.23/128,549.80 - Step 6: Final answer
x = 99,308.12
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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.