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Finding the Fourth Proportional to 212,608.20, 318,912.30 and 123,961.80

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Solution

The fourth proportional to 212,608.20, 318,912.30 and 123,961.80 is: 185,942.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,608.20 : 318,912.30 = 123,961.80 : x
  2. Step 2: Convert to fraction form
    212,608.20/318,912.30 = 123,961.80/x
  3. Step 3: Cross multiply
    212,608.20x = 318,912.30 × 123,961.80
  4. Step 4: Simplify right side
    212,608.20x = 39,532,942,750.14
  5. Step 5: Solve for x
    x = 39,532,942,750.14/212,608.20
  6. Step 6: Final answer
    x = 185,942.70

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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.