Finding the Fourth Proportional to 138,359.12, 190,921.80 and 77,928.08
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Solution
The fourth proportional to 138,359.12, 190,921.80 and 77,928.08 is: 107,532.99
Step by Step Solution
- Step 1: Write the proportion equation
138,359.12 : 190,921.80 = 77,928.08 : x - Step 2: Convert to fraction form
138,359.12/190,921.80 = 77,928.08/x - Step 3: Cross multiply
138,359.12x = 190,921.80 × 77,928.08 - Step 4: Simplify right side
138,359.12x = 14,878,169,304.14 - Step 5: Solve for x
x = 14,878,169,304.14/138,359.12 - Step 6: Final answer
x = 107,532.99
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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.