Finding the Fourth Proportional to 81,420.21, 122,317.43 and 57,786.44
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Solution
The fourth proportional to 81,420.21, 122,317.43 and 57,786.44 is: 86,812.45
Step by Step Solution
- Step 1: Write the proportion equation
81,420.21 : 122,317.43 = 57,786.44 : x - Step 2: Convert to fraction form
81,420.21/122,317.43 = 57,786.44/x - Step 3: Cross multiply
81,420.21x = 122,317.43 × 57,786.44 - Step 4: Simplify right side
81,420.21x = 7,068,287,929.13 - Step 5: Solve for x
x = 7,068,287,929.13/81,420.21 - Step 6: Final answer
x = 86,812.45
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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.