Finding the Fourth Proportional to 91,986.20, 137,979.30 and 84,987.80
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Solution
The fourth proportional to 91,986.20, 137,979.30 and 84,987.80 is: 127,481.70
Step by Step Solution
- Step 1: Write the proportion equation
91,986.20 : 137,979.30 = 84,987.80 : x - Step 2: Convert to fraction form
91,986.20/137,979.30 = 84,987.80/x - Step 3: Cross multiply
91,986.20x = 137,979.30 × 84,987.80 - Step 4: Simplify right side
91,986.20x = 11,726,557,152.54 - Step 5: Solve for x
x = 11,726,557,152.54/91,986.20 - Step 6: Final answer
x = 127,481.70
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.