Finding the Fourth Proportional to 86,643.75, 129,965.63 and 31,239.75
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Solution
The fourth proportional to 86,643.75, 129,965.63 and 31,239.75 is: 46,859.63
Step by Step Solution
- Step 1: Write the proportion equation
86,643.75 : 129,965.63 = 31,239.75 : x - Step 2: Convert to fraction form
86,643.75/129,965.63 = 31,239.75/x - Step 3: Cross multiply
86,643.75x = 129,965.63 × 31,239.75 - Step 4: Simplify right side
86,643.75x = 4,060,093,633.59 - Step 5: Solve for x
x = 4,060,093,633.59/86,643.75 - Step 6: Final answer
x = 46,859.63
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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.