Home / 1,997.43-2,756.88-1,288.77

Finding the Fourth Proportional to 1,997.43, 2,756.88 and 1,288.77

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Solution

The fourth proportional to 1,997.43, 2,756.88 and 1,288.77 is: 1,778.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,997.43 : 2,756.88 = 1,288.77 : x
  2. Step 2: Convert to fraction form
    1,997.43/2,756.88 = 1,288.77/x
  3. Step 3: Cross multiply
    1,997.43x = 2,756.88 × 1,288.77
  4. Step 4: Simplify right side
    1,997.43x = 3,552,984.24
  5. Step 5: Solve for x
    x = 3,552,984.24/1,997.43
  6. Step 6: Final answer
    x = 1,778.78

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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.