Finding the Fourth Proportional to 128,838.28, 177,798.36 and 71,478.68
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Solution
The fourth proportional to 128,838.28, 177,798.36 and 71,478.68 is: 98,641.43
Step by Step Solution
- Step 1: Write the proportion equation
128,838.28 : 177,798.36 = 71,478.68 : x - Step 2: Convert to fraction form
128,838.28/177,798.36 = 71,478.68/x - Step 3: Cross multiply
128,838.28x = 177,798.36 × 71,478.68 - Step 4: Simplify right side
128,838.28x = 12,708,792,078.96 - Step 5: Solve for x
x = 12,708,792,078.96/128,838.28 - Step 6: Final answer
x = 98,641.43
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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.