Finding the Fourth Proportional to 78,240.88, 107,971.68 and 42,431.68
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Solution
The fourth proportional to 78,240.88, 107,971.68 and 42,431.68 is: 58,555.32
Step by Step Solution
- Step 1: Write the proportion equation
78,240.88 : 107,971.68 = 42,431.68 : x - Step 2: Convert to fraction form
78,240.88/107,971.68 = 42,431.68/x - Step 3: Cross multiply
78,240.88x = 107,971.68 × 42,431.68 - Step 4: Simplify right side
78,240.88x = 4,581,419,774.82 - Step 5: Solve for x
x = 4,581,419,774.82/78,240.88 - Step 6: Final answer
x = 58,555.32
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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.