Finding the Fourth Proportional to 212,615.65, 318,763.12 and 128,355.79
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Solution
The fourth proportional to 212,615.65, 318,763.12 and 128,355.79 is: 192,436.88
Step by Step Solution
- Step 1: Write the proportion equation
212,615.65 : 318,763.12 = 128,355.79 : x - Step 2: Convert to fraction form
212,615.65/318,763.12 = 128,355.79/x - Step 3: Cross multiply
212,615.65x = 318,763.12 × 128,355.79 - Step 4: Simplify right side
212,615.65x = 40,915,092,172.02 - Step 5: Solve for x
x = 40,915,092,172.02/212,615.65 - Step 6: Final answer
x = 192,436.88
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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.