Finding the Fourth Proportional to 212,644.60, 318,966.90 and 128,663.80
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Solution
The fourth proportional to 212,644.60, 318,966.90 and 128,663.80 is: 192,995.70
Step by Step Solution
- Step 1: Write the proportion equation
212,644.60 : 318,966.90 = 128,663.80 : x - Step 2: Convert to fraction form
212,644.60/318,966.90 = 128,663.80/x - Step 3: Cross multiply
212,644.60x = 318,966.90 × 128,663.80 - Step 4: Simplify right side
212,644.60x = 41,039,493,428.22 - Step 5: Solve for x
x = 41,039,493,428.22/212,644.60 - Step 6: Final answer
x = 192,995.70
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1.5x scale
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.