Finding the Fourth Proportional to 129,447.72, 178,641.36 and 72,861.12
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Solution
The fourth proportional to 129,447.72, 178,641.36 and 72,861.12 is: 100,550.32
Step by Step Solution
- Step 1: Write the proportion equation
129,447.72 : 178,641.36 = 72,861.12 : x - Step 2: Convert to fraction form
129,447.72/178,641.36 = 72,861.12/x - Step 3: Cross multiply
129,447.72x = 178,641.36 × 72,861.12 - Step 4: Simplify right side
129,447.72x = 13,016,009,567.92 - Step 5: Solve for x
x = 13,016,009,567.92/129,447.72 - Step 6: Final answer
x = 100,550.32
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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.