Finding the Fourth Proportional to 138,831.20, 208,246.80 and 76,623.20
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Solution
The fourth proportional to 138,831.20, 208,246.80 and 76,623.20 is: 114,934.80
Step by Step Solution
- Step 1: Write the proportion equation
138,831.20 : 208,246.80 = 76,623.20 : x - Step 2: Convert to fraction form
138,831.20/208,246.80 = 76,623.20/x - Step 3: Cross multiply
138,831.20x = 208,246.80 × 76,623.20 - Step 4: Simplify right side
138,831.20x = 15,956,536,205.76 - Step 5: Solve for x
x = 15,956,536,205.76/138,831.20 - Step 6: Final answer
x = 114,934.80
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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.