Finding the Fourth Proportional to 121,879.28, 168,163.08 and 76,564.64
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Solution
The fourth proportional to 121,879.28, 168,163.08 and 76,564.64 is: 105,640.15
Step by Step Solution
- Step 1: Write the proportion equation
121,879.28 : 168,163.08 = 76,564.64 : x - Step 2: Convert to fraction form
121,879.28/168,163.08 = 76,564.64/x - Step 3: Cross multiply
121,879.28x = 168,163.08 × 76,564.64 - Step 4: Simplify right side
121,879.28x = 12,875,345,681.49 - Step 5: Solve for x
x = 12,875,345,681.49/121,879.28 - Step 6: Final answer
x = 105,640.15
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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.