Finding the Fourth Proportional to 138,878.24, 207,907.76 and 86,117.92
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Solution
The fourth proportional to 138,878.24, 207,907.76 and 86,117.92 is: 128,922.89
Step by Step Solution
- Step 1: Write the proportion equation
138,878.24 : 207,907.76 = 86,117.92 : x - Step 2: Convert to fraction form
138,878.24/207,907.76 = 86,117.92/x - Step 3: Cross multiply
138,878.24x = 207,907.76 × 86,117.92 - Step 4: Simplify right side
138,878.24x = 17,904,583,843.06 - Step 5: Solve for x
x = 17,904,583,843.06/138,878.24 - Step 6: Final answer
x = 128,922.89
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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.