Finding the Fourth Proportional to 138,038.31, 207,319.92 and 85,812.75
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Solution
The fourth proportional to 138,038.31, 207,319.92 and 85,812.75 is: 128,882.28
Step by Step Solution
- Step 1: Write the proportion equation
138,038.31 : 207,319.92 = 85,812.75 : x - Step 2: Convert to fraction form
138,038.31/207,319.92 = 85,812.75/x - Step 3: Cross multiply
138,038.31x = 207,319.92 × 85,812.75 - Step 4: Simplify right side
138,038.31x = 17,790,692,464.98 - Step 5: Solve for x
x = 17,790,692,464.98/138,038.31 - Step 6: Final answer
x = 128,882.28
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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.