Finding the Fourth Proportional to 81,313.20, 121,969.80 and 66,538.80
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Solution
The fourth proportional to 81,313.20, 121,969.80 and 66,538.80 is: 99,808.20
Step by Step Solution
- Step 1: Write the proportion equation
81,313.20 : 121,969.80 = 66,538.80 : x - Step 2: Convert to fraction form
81,313.20/121,969.80 = 66,538.80/x - Step 3: Cross multiply
81,313.20x = 121,969.80 × 66,538.80 - Step 4: Simplify right side
81,313.20x = 8,115,724,128.24 - Step 5: Solve for x
x = 8,115,724,128.24/81,313.20 - Step 6: Final answer
x = 99,808.20
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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.