Home / 1,912.77-2,638.37-1,380.78

Finding the Fourth Proportional to 1,912.77, 2,638.37 and 1,380.78

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Solution

The fourth proportional to 1,912.77, 2,638.37 and 1,380.78 is: 1,904.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.77 : 2,638.37 = 1,380.78 : x
  2. Step 2: Convert to fraction form
    1,912.77/2,638.37 = 1,380.78/x
  3. Step 3: Cross multiply
    1,912.77x = 2,638.37 × 1,380.78
  4. Step 4: Simplify right side
    1,912.77x = 3,643,011.98
  5. Step 5: Solve for x
    x = 3,643,011.98/1,912.77
  6. Step 6: Final answer
    x = 1,904.57

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1.5x scale

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.