Finding the Fourth Proportional to 86,651.80, 129,977.70 and 76,810.30
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Solution
The fourth proportional to 86,651.80, 129,977.70 and 76,810.30 is: 115,215.45
Step by Step Solution
- Step 1: Write the proportion equation
86,651.80 : 129,977.70 = 76,810.30 : x - Step 2: Convert to fraction form
86,651.80/129,977.70 = 76,810.30/x - Step 3: Cross multiply
86,651.80x = 129,977.70 × 76,810.30 - Step 4: Simplify right side
86,651.80x = 9,983,626,130.31 - Step 5: Solve for x
x = 9,983,626,130.31/86,651.80 - Step 6: Final answer
x = 115,215.45
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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.