Finding the Fourth Proportional to 91,728.70, 128,143.70 and 91,728.70
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Solution
The fourth proportional to 91,728.70, 128,143.70 and 91,728.70 is: 128,143.70
Step by Step Solution
- Step 1: Write the proportion equation
91,728.70 : 128,143.70 = 91,728.70 : x - Step 2: Convert to fraction form
91,728.70/128,143.70 = 91,728.70/x - Step 3: Cross multiply
91,728.70x = 128,143.70 × 91,728.70 - Step 4: Simplify right side
91,728.70x = 11,754,455,014.19 - Step 5: Solve for x
x = 11,754,455,014.19/91,728.70 - Step 6: Final answer
x = 128,143.70
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.