Finding the Fourth Proportional to 99,643.16, 137,479.74 and 57,186.20
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Solution
The fourth proportional to 99,643.16, 137,479.74 and 57,186.20 is: 78,900.99
Step by Step Solution
- Step 1: Write the proportion equation
99,643.16 : 137,479.74 = 57,186.20 : x - Step 2: Convert to fraction form
99,643.16/137,479.74 = 57,186.20/x - Step 3: Cross multiply
99,643.16x = 137,479.74 × 57,186.20 - Step 4: Simplify right side
99,643.16x = 7,861,943,907.59 - Step 5: Solve for x
x = 7,861,943,907.59/99,643.16 - Step 6: Final answer
x = 78,900.99
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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.