Finding the Fourth Proportional to 128,855.67, 177,820.29 and 72,267.09
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Solution
The fourth proportional to 128,855.67, 177,820.29 and 72,267.09 is: 99,728.28
Step by Step Solution
- Step 1: Write the proportion equation
128,855.67 : 177,820.29 = 72,267.09 : x - Step 2: Convert to fraction form
128,855.67/177,820.29 = 72,267.09/x - Step 3: Cross multiply
128,855.67x = 177,820.29 × 72,267.09 - Step 4: Simplify right side
128,855.67x = 12,850,554,901.26 - Step 5: Solve for x
x = 12,850,554,901.26/128,855.67 - Step 6: Final answer
x = 99,728.28
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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.