Finding the Fourth Proportional to 138,319.20, 207,478.80 and 68,335.20
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Solution
The fourth proportional to 138,319.20, 207,478.80 and 68,335.20 is: 102,502.80
Step by Step Solution
- Step 1: Write the proportion equation
138,319.20 : 207,478.80 = 68,335.20 : x - Step 2: Convert to fraction form
138,319.20/207,478.80 = 68,335.20/x - Step 3: Cross multiply
138,319.20x = 207,478.80 × 68,335.20 - Step 4: Simplify right side
138,319.20x = 14,178,105,293.76 - Step 5: Solve for x
x = 14,178,105,293.76/138,319.20 - Step 6: Final answer
x = 102,502.80
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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.