Finding the Fourth Proportional to 138,143.66, 190,622.79 and 77,713.05
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Solution
The fourth proportional to 138,143.66, 190,622.79 and 77,713.05 is: 107,235.32
Step by Step Solution
- Step 1: Write the proportion equation
138,143.66 : 190,622.79 = 77,713.05 : x - Step 2: Convert to fraction form
138,143.66/190,622.79 = 77,713.05/x - Step 3: Cross multiply
138,143.66x = 190,622.79 × 77,713.05 - Step 4: Simplify right side
138,143.66x = 14,813,878,410.41 - Step 5: Solve for x
x = 14,813,878,410.41/138,143.66 - Step 6: Final answer
x = 107,235.32
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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.