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Finding the Fourth Proportional to 1,939.45, 2,912.13 and 1,213.60

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Solution

The fourth proportional to 1,939.45, 2,912.13 and 1,213.60 is: 1,822.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.45 : 2,912.13 = 1,213.60 : x
  2. Step 2: Convert to fraction form
    1,939.45/2,912.13 = 1,213.60/x
  3. Step 3: Cross multiply
    1,939.45x = 2,912.13 × 1,213.60
  4. Step 4: Simplify right side
    1,939.45x = 3,534,160.97
  5. Step 5: Solve for x
    x = 3,534,160.97/1,939.45
  6. Step 6: Final answer
    x = 1,822.25

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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.