Finding the Fourth Proportional to 128,621.65, 177,439.66 and 77,618.07
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Solution
The fourth proportional to 128,621.65, 177,439.66 and 77,618.07 is: 107,077.81
Step by Step Solution
- Step 1: Write the proportion equation
128,621.65 : 177,439.66 = 77,618.07 : x - Step 2: Convert to fraction form
128,621.65/177,439.66 = 77,618.07/x - Step 3: Cross multiply
128,621.65x = 177,439.66 × 77,618.07 - Step 4: Simplify right side
128,621.65x = 13,772,524,692.26 - Step 5: Solve for x
x = 13,772,524,692.26/128,621.65 - Step 6: Final answer
x = 107,077.81
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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.