Finding the Fourth Proportional to 128,581.36, 177,457.44 and 71,981.80
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Solution
The fourth proportional to 128,581.36, 177,457.44 and 71,981.80 is: 99,343.37
Step by Step Solution
- Step 1: Write the proportion equation
128,581.36 : 177,457.44 = 71,981.80 : x - Step 2: Convert to fraction form
128,581.36/177,457.44 = 71,981.80/x - Step 3: Cross multiply
128,581.36x = 177,457.44 × 71,981.80 - Step 4: Simplify right side
128,581.36x = 12,773,705,954.59 - Step 5: Solve for x
x = 12,773,705,954.59/128,581.36 - Step 6: Final answer
x = 99,343.37
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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.