Finding the Fourth Proportional to 138,405.63, 190,998.90 and 77,995.68
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Solution
The fourth proportional to 138,405.63, 190,998.90 and 77,995.68 is: 107,633.55
Step by Step Solution
- Step 1: Write the proportion equation
138,405.63 : 190,998.90 = 77,995.68 : x - Step 2: Convert to fraction form
138,405.63/190,998.90 = 77,995.68/x - Step 3: Cross multiply
138,405.63x = 190,998.90 × 77,995.68 - Step 4: Simplify right side
138,405.63x = 14,897,089,084.75 - Step 5: Solve for x
x = 14,897,089,084.75/138,405.63 - Step 6: Final answer
x = 107,633.55
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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.