Home / 1,991.85-2,748.60-1,107.51

Finding the Fourth Proportional to 1,991.85, 2,748.60 and 1,107.51

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Solution

The fourth proportional to 1,991.85, 2,748.60 and 1,107.51 is: 1,528.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.85 : 2,748.60 = 1,107.51 : x
  2. Step 2: Convert to fraction form
    1,991.85/2,748.60 = 1,107.51/x
  3. Step 3: Cross multiply
    1,991.85x = 2,748.60 × 1,107.51
  4. Step 4: Simplify right side
    1,991.85x = 3,044,101.99
  5. Step 5: Solve for x
    x = 3,044,101.99/1,991.85
  6. Step 6: Final answer
    x = 1,528.28

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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.