Finding the Fourth Proportional to 121,685.68, 168,090.60 and 91,697.68
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Solution
The fourth proportional to 121,685.68, 168,090.60 and 91,697.68 is: 126,666.66
Step by Step Solution
- Step 1: Write the proportion equation
121,685.68 : 168,090.60 = 91,697.68 : x - Step 2: Convert to fraction form
121,685.68/168,090.60 = 91,697.68/x - Step 3: Cross multiply
121,685.68x = 168,090.60 × 91,697.68 - Step 4: Simplify right side
121,685.68x = 15,413,518,049.81 - Step 5: Solve for x
x = 15,413,518,049.81/121,685.68 - Step 6: Final answer
x = 126,666.66
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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.