Home / 1,912.10-2,638.05-1,213.88

Finding the Fourth Proportional to 1,912.10, 2,638.05 and 1,213.88

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Solution

The fourth proportional to 1,912.10, 2,638.05 and 1,213.88 is: 1,674.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.10 : 2,638.05 = 1,213.88 : x
  2. Step 2: Convert to fraction form
    1,912.10/2,638.05 = 1,213.88/x
  3. Step 3: Cross multiply
    1,912.10x = 2,638.05 × 1,213.88
  4. Step 4: Simplify right side
    1,912.10x = 3,202,276.13
  5. Step 5: Solve for x
    x = 3,202,276.13/1,912.10
  6. Step 6: Final answer
    x = 1,674.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.