Finding the Fourth Proportional to 81,391.80, 121,982.58 and 65,604.12
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Solution
The fourth proportional to 81,391.80, 121,982.58 and 65,604.12 is: 98,321.45
Step by Step Solution
- Step 1: Write the proportion equation
81,391.80 : 121,982.58 = 65,604.12 : x - Step 2: Convert to fraction form
81,391.80/121,982.58 = 65,604.12/x - Step 3: Cross multiply
81,391.80x = 121,982.58 × 65,604.12 - Step 4: Simplify right side
81,391.80x = 8,002,559,816.23 - Step 5: Solve for x
x = 8,002,559,816.23/81,391.80 - Step 6: Final answer
x = 98,321.45
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.