Finding the Fourth Proportional to 138,883.47, 191,670.99 and 78,465.21
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Solution
The fourth proportional to 138,883.47, 191,670.99 and 78,465.21 is: 108,288.66
Step by Step Solution
- Step 1: Write the proportion equation
138,883.47 : 191,670.99 = 78,465.21 : x - Step 2: Convert to fraction form
138,883.47/191,670.99 = 78,465.21/x - Step 3: Cross multiply
138,883.47x = 191,670.99 × 78,465.21 - Step 4: Simplify right side
138,883.47x = 15,039,504,481.26 - Step 5: Solve for x
x = 15,039,504,481.26/138,883.47 - Step 6: Final answer
x = 108,288.66
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.