Finding the Fourth Proportional to 135,639.81, 187,221.93 and 81,915.75
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Solution
The fourth proportional to 135,639.81, 187,221.93 and 81,915.75 is: 113,067.28
Step by Step Solution
- Step 1: Write the proportion equation
135,639.81 : 187,221.93 = 81,915.75 : x - Step 2: Convert to fraction form
135,639.81/187,221.93 = 81,915.75/x - Step 3: Cross multiply
135,639.81x = 187,221.93 × 81,915.75 - Step 4: Simplify right side
135,639.81x = 15,336,424,812.40 - Step 5: Solve for x
x = 15,336,424,812.40/135,639.81 - Step 6: Final answer
x = 113,067.28
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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.