Finding the Fourth Proportional to 100,420.75, 138,580.64 and 55,708.75
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Solution
The fourth proportional to 100,420.75, 138,580.64 and 55,708.75 is: 76,878.08
Step by Step Solution
- Step 1: Write the proportion equation
100,420.75 : 138,580.64 = 55,708.75 : x - Step 2: Convert to fraction form
100,420.75/138,580.64 = 55,708.75/x - Step 3: Cross multiply
100,420.75x = 138,580.64 × 55,708.75 - Step 4: Simplify right side
100,420.75x = 7,720,154,228.60 - Step 5: Solve for x
x = 7,720,154,228.60/100,420.75 - Step 6: Final answer
x = 76,878.08
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.