Finding the Fourth Proportional to 128,609.70, 177,481.35 and 71,252.75
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Solution
The fourth proportional to 128,609.70, 177,481.35 and 71,252.75 is: 98,328.77
Step by Step Solution
- Step 1: Write the proportion equation
128,609.70 : 177,481.35 = 71,252.75 : x - Step 2: Convert to fraction form
128,609.70/177,481.35 = 71,252.75/x - Step 3: Cross multiply
128,609.70x = 177,481.35 × 71,252.75 - Step 4: Simplify right side
128,609.70x = 12,646,033,373.81 - Step 5: Solve for x
x = 12,646,033,373.81/128,609.70 - Step 6: Final answer
x = 98,328.77
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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.