Home / 1,991.91-2,748.68-1,107.59

Finding the Fourth Proportional to 1,991.91, 2,748.68 and 1,107.59

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Solution

The fourth proportional to 1,991.91, 2,748.68 and 1,107.59 is: 1,528.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.91 : 2,748.68 = 1,107.59 : x
  2. Step 2: Convert to fraction form
    1,991.91/2,748.68 = 1,107.59/x
  3. Step 3: Cross multiply
    1,991.91x = 2,748.68 × 1,107.59
  4. Step 4: Simplify right side
    1,991.91x = 3,044,410.48
  5. Step 5: Solve for x
    x = 3,044,410.48/1,991.91
  6. Step 6: Final answer
    x = 1,528.39

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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.