Finding the Fourth Proportional to 128,431.20, 177,157.56 and 84,824.02
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Solution
The fourth proportional to 128,431.20, 177,157.56 and 84,824.02 is: 117,005.96
Step by Step Solution
- Step 1: Write the proportion equation
128,431.20 : 177,157.56 = 84,824.02 : x - Step 2: Convert to fraction form
128,431.20/177,157.56 = 84,824.02/x - Step 3: Cross multiply
128,431.20x = 177,157.56 × 84,824.02 - Step 4: Simplify right side
128,431.20x = 15,027,216,412.59 - Step 5: Solve for x
x = 15,027,216,412.59/128,431.20 - Step 6: Final answer
x = 117,005.96
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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.