Finding the Fourth Proportional to 138,631.30, 207,946.95 and 121,135.30
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Solution
The fourth proportional to 138,631.30, 207,946.95 and 121,135.30 is: 181,702.95
Step by Step Solution
- Step 1: Write the proportion equation
138,631.30 : 207,946.95 = 121,135.30 : x - Step 2: Convert to fraction form
138,631.30/207,946.95 = 121,135.30/x - Step 3: Cross multiply
138,631.30x = 207,946.95 × 121,135.30 - Step 4: Simplify right side
138,631.30x = 25,189,716,172.34 - Step 5: Solve for x
x = 25,189,716,172.34/138,631.30 - Step 6: Final answer
x = 181,702.95
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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.