Finding the Fourth Proportional to 100,618.42, 138,853.32 and 55,299.31
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Solution
The fourth proportional to 100,618.42, 138,853.32 and 55,299.31 is: 76,312.99
Step by Step Solution
- Step 1: Write the proportion equation
100,618.42 : 138,853.32 = 55,299.31 : x - Step 2: Convert to fraction form
100,618.42/138,853.32 = 55,299.31/x - Step 3: Cross multiply
100,618.42x = 138,853.32 × 55,299.31 - Step 4: Simplify right side
100,618.42x = 7,678,492,787.21 - Step 5: Solve for x
x = 7,678,492,787.21/100,618.42 - Step 6: Final answer
x = 76,312.99
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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.