Finding the Fourth Proportional to 129,985.20, 194,977.80 and 115,210.80
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Solution
The fourth proportional to 129,985.20, 194,977.80 and 115,210.80 is: 172,816.20
Step by Step Solution
- Step 1: Write the proportion equation
129,985.20 : 194,977.80 = 115,210.80 : x - Step 2: Convert to fraction form
129,985.20/194,977.80 = 115,210.80/x - Step 3: Cross multiply
129,985.20x = 194,977.80 × 115,210.80 - Step 4: Simplify right side
129,985.20x = 22,463,548,320.24 - Step 5: Solve for x
x = 22,463,548,320.24/129,985.20 - Step 6: Final answer
x = 172,816.20
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1.5x scale
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.