Finding the Fourth Proportional to 138,659.80, 207,989.70 and 129,911.80
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Solution
The fourth proportional to 138,659.80, 207,989.70 and 129,911.80 is: 194,867.70
Step by Step Solution
- Step 1: Write the proportion equation
138,659.80 : 207,989.70 = 129,911.80 : x - Step 2: Convert to fraction form
138,659.80/207,989.70 = 129,911.80/x - Step 3: Cross multiply
138,659.80x = 207,989.70 × 129,911.80 - Step 4: Simplify right side
138,659.80x = 27,020,316,308.46 - Step 5: Solve for x
x = 27,020,316,308.46/138,659.80 - Step 6: Final answer
x = 194,867.70
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1.5x scale
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.