Finding the Fourth Proportional to 128,767.74, 177,698.84 and 72,179.12
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Solution
The fourth proportional to 128,767.74, 177,698.84 and 72,179.12 is: 99,606.83
Step by Step Solution
- Step 1: Write the proportion equation
128,767.74 : 177,698.84 = 72,179.12 : x - Step 2: Convert to fraction form
128,767.74/177,698.84 = 72,179.12/x - Step 3: Cross multiply
128,767.74x = 177,698.84 × 72,179.12 - Step 4: Simplify right side
128,767.74x = 12,826,145,896.22 - Step 5: Solve for x
x = 12,826,145,896.22/128,767.74 - Step 6: Final answer
x = 99,606.83
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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.