Finding the Fourth Proportional to 128,965.66, 177,989.01 and 72,377.03
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Solution
The fourth proportional to 128,965.66, 177,989.01 and 72,377.03 is: 99,889.50
Step by Step Solution
- Step 1: Write the proportion equation
128,965.66 : 177,989.01 = 72,377.03 : x - Step 2: Convert to fraction form
128,965.66/177,989.01 = 72,377.03/x - Step 3: Cross multiply
128,965.66x = 177,989.01 × 72,377.03 - Step 4: Simplify right side
128,965.66x = 12,882,315,916.44 - Step 5: Solve for x
x = 12,882,315,916.44/128,965.66 - Step 6: Final answer
x = 99,889.50
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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.